News

RWE Renewables UK Wind Ltd at Rampion Windfarm would like to inform mariners that we are carrying out essential maintenance on the wind turbines, this is an updated asset list due to additional repairs being required.

This work commenced on 20th May 2025 for 120 days, within the Rampion OWF Area, depending on weather conditions.

Start Date: Subject to weather 20th May 2025 For the safety of the working party and anyone in the vicinity of the works, mariners are requested to be vigilant if approaching any of the below listed locations and adhere to a 500m exclusion zone around any locations upon which repairs are being carried out.

The operations will be undertaken by the Spectrum Nyquist pictured below. The vessels may not commence their activities at the same time but may operate simultaneously at times over the duration of the operation. The vessels may operate primarily from Cowes, Isle of Wight but may use other ports along the Solent coastlines, such as Yarmouth, Lymington, Portsmouth or Poole Harbour.

Survey Description

The survey operations will use the Spectrum Nyquist to acquire data from survey line plan within a corridor around the proposed cable route. An additional larger operational area around the survey area will be utilised for vessel manoeuvring. Other vessels should maintain an appropriate and safe distance of 500 m when passing the survey vessel(s) whilst undertaking operations and should pass at the lowest possible speed to avoid vessel wash effects. The vessel(s) will be working 12-hour operations and will display appropriate day shapes and lights during reduced visibility and night operations. The vessel(s) will also monitor VHF Channels 16 and 12.

Fisheries Liaison Officers

Fishing liaison for the operations will be co-ordinated by Brown & May Marine. For any commercial fishery queries please contact the Company Fishing Liaison Officers (CFLOs) Meg Kalafat at Meg.Kalafat@brownmay.com or +44 7702710176. The local Fishing Industries Representative (FIR) Ian White will also be in place to liaise with the vessels and fishing operations in the area. iannwhite@hotmail.co.uk or +44 7986774725

Legal Notice

Please be advised that this Notice to Mariners should be treated as official notice of the nature, duration and location of the works which are scheduled to take place. During the period of this notice, we request that you plan your activities around our short-term, temporary activities. Entry into the identified location in a manner that would constitute a hazard would be a breach of your duties of safe seamanship as described in the Convention on International Regulations for Preventing Collisions at Sea 1972 and/or the Merchant Shipping Act 1995 and may result in removal of the relevant equipment. Entry into the identified location in a manner that would constitute a hazard may constitute a breach of duty of care at common law, and a failure to protect submarine cables for successful seabed user co-existence

Please be advised that there is a section of exposed cable between 51° 21.0462' N, 2° 44.1482' E and 51°19.0035N, 2°46.4372E. Until burial is conducted, there will be a guard vessel (Defender) on site but please ensure vessels proceed with caution. For further information please do not hesitate to get in touch.

This Notice is to inform that the Green Volt Offshore Windfarm Ltd will be carrying out a Geotechnical survey within the Green Volt array area. The survey will be carried out by the Gardline vessel Horizon Prospector with mobilisation planned for the 1 st July 2025 and the survey anticipated to last until the 31st August 2025. The Geotechnical survey will comprise of bore holes and seabed Cone Penetration Tests (CPT) during this period. The vessel Ocean Vantage will also be on site to assist with CPTs.

Survey Activities: XOCEAN is planning the collection of geophysical data using remotely piloted Uncrewed Surface Vessels (USVs) along a proposed cable route corridor from Isle of Islay to West Kintyre. The USVs are expected to operate out of Lagavulin bay for the full length of survey. A mix of USVs that use both hull mounted survey sensors (Multibeam Echosounders & Sub-Bottom Profilers) and also towed sensors (SideScan Sonar & Magnetometer) through the water in proximity of the seabed will be used. A crewed Support Vessel will be chartered throughout the survey to support the USVs with departures and arrivals from the port and assist in towing them back in if a technical issue occurs.

Dates/Duration: Operations are expected to commence around 1st July 2025. It is expected that the survey activities shall be completed within 3-4 weeks (subject to weather).

All mariners and stakeholders are advised that unexploded ordnance mitigation and clearance works will commence within the Inch Cape export cable corridor and wind farm site.

Whilst low order disposal techniques are preferred, high order disposal methodology may be used depending on the condition of individual items.

All mitigation and clearance activities will be conducted from the vessel 4-Winds which will utilise a support rigid inflatable vessel.

The 4-Winds will manage avoidance zones during disposal operations, informing any vessels in the vicinity of operations via VHF radio calls.

4-Winds is expected to commence confirmed unexploded ordnance clearance and mitigation activities today, 18th June

Geotechnical testing of the soils including (dependent on what is recovered):

o PSD.

o Atterberg.

o Shear box.

o Triaxial.

o Chemical testing.

Geophysics including:

o Electrical Resistivity.

o Electromagnetism

NEXANS Orkney Link Pre-Lay Engineering Survey

Geophysical UXO survey will take place on or around 15th May – 15th July from vessel MV Ivero. The vessel will be operating Scotland and Orkney mainland, outside of main shipping channels. Ivero will be RESTRICTED in ability to manoeuvre operating towed survey sensors. Vessel will display RAMs day shapes and appropriate signals informing other vessels in the vicinity. During periods of poor weather, Ivero will port call in Scrabster in times when the vessel cannot remain at sea. The vessel will be listening on VHF Channels 12 and 16 for direct contact.

Clump weight is 2500kg, approximately 0.75m^3 and lies <1m on the seabed.

Please be advised of this notice advising mariners of the dredging and repair of Gwynt Y Mor export cable. The Capall Mara will carry out the dredging works and will be assisted by CTV Gladiator. The work will start last week of June/first week of July. The works are scheduled to mid of August subject to weather.

The operations will be undertaken by the Spectrum Nyquist pictured below. The vessel may operate primarily from Cowes, Isle of Wight but may use other ports along the Solent coastlines, such as Yarmouth, Lymington, Portsmouth or Poole Harbour.

Survey Description

The survey operations will use the Spectrum Nyquist to acquire data from survey line plan within a corridor around the proposed cable route. An additional larger operational area around the survey area will be utilised for vessel manoeuvring. Other vessels should maintain an appropriate and safe distance of 500 m when passing the survey vessel(s) whilst undertaking operations and should pass at the lowest possible speed to avoid vessel wash effects. The vessel(s) will be working 12-hour operations and will display appropriate day shapes and lights during reduced visibility and night operations. The vessel(s) will also monitor VHF Channels 16 and 12

Fisheries Liaison Officers

Fishing liaison for the operations will be co-ordinated by Brown & May Marine. For any commercial fishery queries please contact the Company Fishing Liaison Officers (CFLOs) Meg Kalafat at Meg.Kalafat@brownmay.com or +44 7702710176. The local Fishing Industries Representative (FIR) Ian White will also be in place to liaise with the vessels and fishing operations in the area. iannwhite@hotmail.co.uk or +44 7986774725

Legal Notice

Please be advised that this Notice to Mariners should be treated as official notice of the nature, duration and location of the works which are scheduled to take place. During the period of this notice, we request that you plan your activities around our short-term, temporary activities. Entry into the identified location in a manner that would constitute a hazard would be a breach of your duties of safe seamanship as described in the Convention on International Regulations for Preventing Collisions at Sea 1972 and/or the Merchant Shipping Act 1995 and may result in removal of the relevant equipment. Entry into the identified location in a manner that would constitute a hazard may constitute a breach of duty of care at common law, and a failure to protect submarine cables for successful seabed user co-existence

The operations will be undertaken by the Spectrum 1 and Spectrum Nyquist. The vessels may not commence their activities at the same time but may operate simultaneously at times over the duration of the operation. The vessels may operate primarily from Cowes, Isle of Wight but may use other ports along the Solent coastlines, such as Yarmouth, Lymington, Portsmouth or Poole Harbour.

Survey Description

The survey operations will use a combination of Spectrum 1 and Spectrum Nyquist vessels. These vessels will acquire data from survey line plan within a corridor around the proposed cable route. An additional larger operational area around the survey area will be utilised for vessel manoeuvring. Other vessels should maintain an appropriate and safe distance of 500 m when passing the survey vessel(s) whilst undertaking operations and should pass at the lowest possible speed to avoid vessel wash effects. The vessel(s) will be working 12-hour operations and will display appropriate day shapes and lights during reduced visibility and night operations. The vessel(s) will also monitor VHF Channels 16 and 12.

Fisheries Liaison Officers

Fishing liaison for the operations will be co-ordinated by Brown & May Marine. For any commercial fishery queries please contact the Company Fishing Liaison Officers (CFLOs) Meg Kalafat at Meg.Kalafat@brownmay.com or +44 7702710176. The local Fishing Industries Representative (FIR) Ian White will also be in place to liaise with the vessels and fishing operations in the area. iannwhite@hotmail.co.uk or +44 7986774725

Legal Notice

Please be advised that this Notice to Mariners should be treated as official notice of the nature, duration and location of the works which are scheduled to take place. During the period of this notice, we request that you plan your activities around our short-term, temporary activities. Entry into the identified location in a manner that would constitute a hazard would be a breach of your duties of safe seamanship as described in the Convention on International Regulations for Preventing Collisions at Sea 1972 and/or the Merchant Shipping Act 1995 and may result in removal of the relevant equipment. Entry into the identified location in a manner that would constitute a hazard may constitute a breach of duty of care at common law, and a failure to protect submarine cables for successful seabed user co-existence

The operations will be undertaken by the Spectrum Nyquist pictured below. The vessel may operate primarily from Cowes, Isle of Wight but may use other ports along the Solent coastlines, such as Yarmouth, Lymington, Portsmouth or Poole Harbour.

Survey Description

The survey operations will use the Spectrum Nyquist to acquire data from survey line plan within a corridor around the proposed cable route. An additional larger operational area around the survey area will be utilised for vessel manoeuvring. Other vessels should maintain an appropriate and safe distance of 500 m when passing the survey vessel(s) whilst undertaking operations and should pass at the lowest possible speed to avoid vessel wash effects. The vessel(s) will be working 12-hour operations and will display appropriate day shapes and lights during reduced visibility and night operations. The vessel(s) will also monitor VHF Channels 16 and 12

Fisheries Liaison Officers

Fishing liaison for the operations will be co-ordinated by Brown & May Marine. For any commercial fishery queries please contact the Company Fishing Liaison Officers (CFLOs) Meg Kalafat at Meg.Kalafat@brownmay.com or +44 7702710176. The local Fishing Industries Representative (FIR) Ian White will also be in place to liaise with the vessels and fishing operations in the area. iannwhite@hotmail.co.uk or +44 7986774725

Legal Notice

Please be advised that this Notice to Mariners should be treated as official notice of the nature, duration and location of the works which are scheduled to take place. During the period of this notice, we request that you plan your activities around our short-term, temporary activities. Entry into the identified location in a manner that would constitute a hazard would be a breach of your duties of safe seamanship as described in the Convention on International Regulations for Preventing Collisions at Sea 1972 and/or the Merchant Shipping Act 1995 and may result in removal of the relevant equipment. Entry into the identified location in a manner that would constitute a hazard may constitute a breach of duty of care at common law, and a failure to protect submarine cables for successful seabed user co-existence

The operations will be undertaken by the Spectrum Nyquist pictured below. The vessel may operate primarily from Cowes, Isle of Wight but may use other ports along the Solent coastlines, such as Yarmouth, Lymington, Portsmouth or Poole Harbour.

Survey Description

The survey operations will use the Spectrum Nyquist to acquire data from survey line plan within a corridor around the proposed cable route. An additional larger operational area around the survey area will be utilised for vessel manoeuvring. Other vessels should maintain an appropriate and safe distance of 500 m when passing the survey vessel(s) whilst undertaking operations and should pass at the lowest possible speed to avoid vessel wash effects. The vessel(s) will be working 12-hour operations and will display appropriate day shapes and lights during reduced visibility and night operations. The vessel(s) will also monitor VHF Channels 16 and 12

Fisheries Liaison Officers

Fishing liaison for the operations will be co-ordinated by Brown & May Marine. For any commercial fishery queries please contact the Company Fishing Liaison Officers (CFLOs) Meg Kalafat at Meg.Kalafat@brownmay.com or +44 7702710176. The local Fishing Industries Representative (FIR) Ian White will also be in place to liaise with the vessels and fishing operations in the area. iannwhite@hotmail.co.uk or +44 7986774725

Legal Notice

Please be advised that this Notice to Mariners should be treated as official notice of the nature, duration and location of the works which are scheduled to take place. During the period of this notice, we request that you plan your activities around our short-term, temporary activities. Entry into the identified location in a manner that would constitute a hazard would be a breach of your duties of safe seamanship as described in the Convention on International Regulations for Preventing Collisions at Sea 1972 and/or the Merchant Shipping Act 1995 and may result in removal of the relevant equipment. Entry into the identified location in a manner that would constitute a hazard may constitute a breach of duty of care at common law, and a failure to protect submarine cables for successful seabed user co-existence

The operations will be undertaken by the Spectrum Nyquist pictured below. The vessel may operate primarily from Cowes, Isle of Wight but may use other ports along the Solent coastlines, such as Yarmouth, Lymington, Portsmouth or Poole Harbour.

Survey Description

The survey operations will use the Spectrum Nyquist to acquire data from survey line plan within a corridor around the proposed cable route. An additional larger operational area around the survey area will be utilised for vessel manoeuvring. Other vessels should maintain an appropriate and safe distance of 500 m when passing the survey vessel(s) whilst undertaking operations and should pass at the lowest possible speed to avoid vessel wash effects. The vessel(s) will be working 12-hour operations and will display appropriate day shapes and lights during reduced visibility and night operations. The vessel(s) will also monitor VHF Channels 16 and 12

Fisheries Liaison Officers

Fishing liaison for the operations will be co-ordinated by Brown & May Marine. For any commercial fishery queries please contact the Company Fishing Liaison Officers (CFLOs) Meg Kalafat at Meg.Kalafat@brownmay.com or +44 7702710176. The local Fishing Industries Representative (FIR) Ian White will also be in place to liaise with the vessels and fishing operations in the area. iannwhite@hotmail.co.uk or +44 7986774725

Legal Notice

Please be advised that this Notice to Mariners should be treated as official notice of the nature, duration and location of the works which are scheduled to take place. During the period of this notice, we request that you plan your activities around our short-term, temporary activities. Entry into the identified location in a manner that would constitute a hazard would be a breach of your duties of safe seamanship as described in the Convention on International Regulations for Preventing Collisions at Sea 1972 and/or the Merchant Shipping Act 1995 and may result in removal of the relevant equipment. Entry into the identified location in a manner that would constitute a hazard may constitute a breach of duty of care at common law, and a failure to protect submarine cables for successful seabed user co-existence

The operations will be undertaken by the Spectrum Nyquist pictured below. The vessel may operate primarily from Cowes, Isle of Wight but may use other ports along the Solent coastlines, such as Yarmouth, Lymington, Portsmouth or Poole Harbour.

Survey Description

The survey operations will use the Spectrum Nyquist to acquire data from survey line plan within a corridor around the proposed cable route. An additional larger operational area around the survey area will be utilised for vessel manoeuvring. Other vessels should maintain an appropriate and safe distance of 500 m when passing the survey vessel(s) whilst undertaking operations and should pass at the lowest possible speed to avoid vessel wash effects. The vessel(s) will be working 12-hour operations and will display appropriate day shapes and lights during reduced visibility and night operations. The vessel(s) will also monitor VHF Channels 16 and 12.

Fisheries Liaison Officers

Fishing liaison for the operations will be co-ordinated by Brown & May Marine. For any commercial fishery queries please contact the Company Fishing Liaison Officers (CFLOs) Meg Kalafat at Meg.Kalafat@brownmay.com or +44 7702710176. The local Fishing Industries Representative (FIR) Ian White will also be in place to liaise with the vessels and fishing operations in the area. iannwhite@hotmail.co.uk or +44 7986774725

Legal Notice

Please be advised that this Notice to Mariners should be treated as official notice of the nature, duration and location of the works which are scheduled to take place. During the period of this notice, we request that you plan your activities around our short-term, temporary activities. Entry into the identified location in a manner that would constitute a hazard would be a breach of your duties of safe seamanship as described in the Convention on International Regulations for Preventing Collisions at Sea 1972 and/or the Merchant Shipping Act 1995 and may result in removal of the relevant equipment. Entry into the identified location in a manner that would constitute a hazard may constitute a breach of duty of care at common law, and a failure to protect submarine cables for successful seabed user co-existence

The operations will be undertaken by the Spectrum Nyquist pictured below. The vessel may operate primarily from Cowes, Isle of Wight but may use other ports along the Solent coastlines, such as Yarmouth, Lymington, Portsmouth or Poole Harbour.

Survey Description

The survey operations will use the Spectrum Nyquist to acquire data from survey line plan within a corridor around the proposed cable route. An additional larger operational area around the survey area will be utilised for vessel manoeuvring. Other vessels should maintain an appropriate and safe distance of 500 m when passing the survey vessel(s) whilst undertaking operations and should pass at the lowest possible speed to avoid vessel wash effects. The vessel(s) will be working 12-hour operations and will display appropriate day shapes and lights during reduced visibility and night operations. The vessel(s) will also monitor VHF Channels 16 and 12

Fisheries Liaison Officers

Fishing liaison for the operations will be co-ordinated by Brown & May Marine. For any commercial fishery queries please contact the Company Fishing Liaison Officers (CFLOs) Meg Kalafat at Meg.Kalafat@brownmay.com or +44 7702710176. The local Fishing Industries Representative (FIR) Ian White will also be in place to liaise with the vessels and fishing operations in the area. iannwhite@hotmail.co.uk or +44 7986774725

Legal Notice

Please be advised that this Notice to Mariners should be treated as official notice of the nature, duration and location of the works which are scheduled to take place. During the period of this notice, we request that you plan your activities around our short-term, temporary activities. Entry into the identified location in a manner that would constitute a hazard would be a breach of your duties of safe seamanship as described in the Convention on International Regulations for Preventing Collisions at Sea 1972 and/or the Merchant Shipping Act 1995 and may result in removal of the relevant equipment. Entry into the identified location in a manner that would constitute a hazard may constitute a breach of duty of care at common law, and a failure to protect submarine cables for successful seabed user co-existence

The operations will be undertaken by the Spectrum Nyquist pictured below. The vessel may operate primarily from Cowes, Isle of Wight but may use other ports along the Solent coastlines, such as Yarmouth, Lymington, Portsmouth or Poole Harbour.

Survey Description

The survey operations will use the Spectrum Nyquist to acquire data from survey line plan within a corridor around the proposed cable route. An additional larger operational area around the survey area will be utilised for vessel manoeuvring. Other vessels should maintain an appropriate and safe distance of 500 m when passing the survey vessel(s) whilst undertaking operations and should pass at the lowest possible speed to avoid vessel wash effects. The vessel(s) will be working 12-hour operations and will display appropriate day shapes and lights during reduced visibility and night operations. The vessel(s) will also monitor VHF Channels 16 and 12.

Fisheries Liaison Officers

Fishing liaison for the operations will be co-ordinated by Brown & May Marine. For any commercial fishery queries please contact the Company Fishing Liaison Officers (CFLOs) Meg Kalafat at Meg.Kalafat@brownmay.com or +44 7702710176. The local Fishing Industries Representative (FIR) Ian White will also be in place to liaise with the vessels and fishing operations in the area. iannwhite@hotmail.co.uk or +44 7986774725

Legal Notice

Please be advised that this Notice to Mariners should be treated as official notice of the nature, duration and location of the works which are scheduled to take place. During the period of this notice, we request that you plan your activities around our short-term, temporary activities. Entry into the identified location in a manner that would constitute a hazard would be a breach of your duties of safe seamanship as described in the Convention on International Regulations for Preventing Collisions at Sea 1972 and/or the Merchant Shipping Act 1995 and may result in removal of the relevant equipment. Entry into the identified location in a manner that would constitute a hazard may constitute a breach of duty of care at common law, and a failure to protect submarine cables for successful seabed user co-existence

The operations will be undertaken by the Spectrum Nyquist. The vessel may operate primarily from Cowes, Isle of Wight but may use other ports along the Solent coastlines, such as Yarmouth, Lymington, Portsmouth or Poole Harbour.

The survey operations will use the Spectrum Nyquist to acquire data from survey line plan within a corridor around the proposed cable route. An additional larger operational area around the survey area will be utilised for vessel manoeuvring. Other vessels should maintain an appropriate and safe distance of 500 m when passing the survey vessel(s) whilst undertaking operations and should pass at the lowest possible speed to avoid vessel wash effects. The vessel(s) will be working 12-hour operations and will display appropriate day shapes and lights during reduced visibility and night operations. The vessel(s) will also monitor VHF Channels 16 and 12.

Fishing liaison for the operations will be co-ordinated by Brown & May Marine. For any commercial fishery queries please contact the Company Fishing Liaison Officers (CFLOs) Meg Kalafat at Meg.Kalafat@brownmay.com or +44 7702710176 The local Fishing Industries Representative (FIR) Ian White will also be in place to liaise with the vessels and fishing operations in the are - iannwhite@hotmail.co.uk or +44 7986774725

Legal Notice -

Please be advised that this Notice to Mariners should be treated as official notice of the nature, duration and location of the works which are scheduled to take place. During the period of this notice, we request that you plan your activities around our short-term, temporary activities. Entry into the identified location in a manner that would constitute a hazard would be a breach of your duties of safe seamanship as described in the Convention on International Regulations for Preventing Collisions at Sea 1972 and/or the Merchant Shipping Act 1995 and may result in removal of the relevant equipment. Entry into the identified location in a manner that would constitute a hazard may constitute a breach of duty of care at common law, and a failure to protect submarine cables for successful seabed user co-existence.

This campaign will commence around 26th of May 2025 and continue until approximately 31st of May 2025. The works will be continuous, 24 hours a day. Charts of the DBB array area are provided below.

The operations include a single pre-lay grapnel run over the centre of part of the array cable routes prior to IAC installation by means of a grapnel train to mitigate the risk of encountering subsea obstructions such as discarded fishing gear, wires, etc. 

During operations, the MAINPORT GEO will be restricted in its ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessel will also transmit an Automatic Identification System (AIS) message. 

It is requested that all vessels maintain a minimum of 1.5Nm separation distance from the vessel and pass at reduced speed. Fishing gear or other equipment with seabed intervention should not be deployed when approaching the working corridor.

Dogger Bank B Inter-Array Cable Termination and Testing

The SOV Grampian Derwent and Grampian Tees will continue with IAC Termination and Testing works. All works will be continuous, 24 hours a day. During operations, the Grampian Derwent will be restricted in their ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessel will also transmit an Automatic Identification System (AIS) message.

PLGR

The Offshore Suport Vessel Mainport Geo will carry out Pre-Lay Grapnel Runs (PLGR) on the remaining IA Cables in DBB

Rollingstone will start operations on 23rd of May 2025 and will perform rock placement during multiple load-outs, finishing her scope around 15th of June 2025. Work will be continuous, 24 hours a day.

During operations, Rollingstone will be restricted in their ability to manoeuvre, as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessel will also transmit an Automatic Identification System (AIS) message.

It is requested that all vessels maintain a minimum of 500m separation distance from the Rollingstone and pass at reduced speed.

Monopile Installation

The Offshore installation vessel, HLV Seaway Strashnov, will install mono-pile foundations in the Dogger Bank C offshore windfarm construction area, commencing on the 22nd April 2025, continuing until approximately Q4 2025. The works will be continuous 24 hours a day.

The installed monopiles will be marked with temporary lighting with the following characteristics:

• Flashing (Fl) Yellow (Y) 2.5 seconds (s)

• IALA Availability Category 2 (not less than 99.0%)

• 360° visibility – up to two lights per structure may be used to achieve this

• At least 2 nm range.

During operations, the HLV Seaway Strashnov will be restricted in ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessels will also transmit an Automatic Identification System (AIS) message.

OSP Commissioning works

The Dogger Bank C Offshore Substation Platform (OSP) will undergo a Commissioning phase within the Dogger Bank C construction area. The Jack up Vessel (JUV) HEA Hydra will jack up and connect to the DBC OSP by a fixed gangway. The HEA Hydra will remain on site during the Commissioning phase, acting as the accommodation platform and OSP emergency evacuation vessel.

The works will commence on approximately the 15th of May 2025, continuing until approximately 11th of September 2025. The works will be continuous 24 hours a day. A chart of the DBC construction area and the installation location is provided below.

During operations, a Statutory Safety zone of 500m radius will be in place around the HEA Hydra for the duration of the Commissioning phase of the DBC OSP. Vessels are requested to maintain a minimum safe passing distance of 1km from the HEA Hydra during the operation.

The Platform Supply Vessel (PSV) FS Balmoral will support the HEA Hydra, carrying out regular supply runs to the offshore site.

During the Commissioning phase, there will be a requirement for rope access works to be carried out to the external parts of the OSP and Jacket. During these Over the Side (OTS) works the Dogger Bank OWF Guard vessel Jacobus will act as the Emergency Response Rescue Vessel (ERRV).

Seabed Preparation Survey:

Mariners are advised that Orsted have completed a bathymetric survey for the purpose of seabed preparation works for the Hornsea Three Export Cable Route (ECR), located within the UK Sector of the North Sea. 

Boulder and Debris Relocation Works:

Mariners are advised that Orsted will be commencing boulder and debris relocation to support seabed preparation works for the Hornsea Three ECR on 15th June 2025. 

The development of the windfarm is made up of several elements - current ongoing elements include:

Construction Support Activities

The Offshore Construction Support Vessels Boreas Enabler,  IWS Skywalker, IWS Starwalker, Grampian Tweed and Grampian Tyne will carry out construction support activities within Dogger Bank A construction site.

Wind Turbine Generator (WTG) Installation

The Jack-up WTG Installation Vessel, Voltaire, will install wind turbine generators (WTG) within the Dogger Bank A construction area. the Voltaire has completed scheduled maintenance and has returned to WTG Installation operations.

The works commenced on the 18th of July 2023, continuing until approximately Q4 2025.  The works will be continuous, 24 hours a day.  A running list of the completed WTG installations and the next locations to be installed is presented in the Installation progress table in the WNoO.

Rock Armour installation The fall pipe vessel, Rollingstone, will perform seabed rock armour installation at various WTG foundation locations in the DBA construction site. Work will start on approx. 24th May 2025.

The Geophysical UXO survey will take place on or around 15th May – 15th June from vessel MV Ivero. The vessel will be operating Scotland and Orkney mainland, outside of main shipping channels.

Ivero will be RESTRICTED in ability to manoeuvre operating towed survey sensors. Vessel will display RAMs day shapes and appropriate signals informing other vessels in the vicinity. During periods of poor weather, Ivero will port call in Scrabster in times when the vessel cannot remain at sea.

The vessel will be listening on VHF Channels 12 and 16 for direct contact.

GeoXYZ will utilise the ‘Geosurveyor XI' to perform a Pre-Installation Survey within the East Anglia THREE Offshore Windfarm.

The vessel will conduct Multibeam Echo Sounder (MBES) and Side Scan Sonar (SSS) surveys of the WTG foundation locations where monopiles are not yet installed, at a radius of 170m.

The Geosurveyor XI will also conduct a Multibeam Echo Sounder survey along the Inter Array Cable route.

Geosurveyor XI is expected to mobilize from the port of ‘Lowestoft’ circa the 25/06/2025. It is anticipated that the campaign will last approximately 8 days, the end of the campaign will be communicated by closure of this notice to mariners.

Geophysical survey to evaluate the underlying geology. The vessels will be towing a system of about 100m at or just below the surface. The survey will be running lines in the survey areas at about 3knots.

The dive operations for EGL 2 are due to commence on 16th of June 2025. The works are to be conducted within the 6-off zones shown by Figure 1, and updated coordinates are detailed in Table 1, both given below. The works consist of Divers carrying out target investigation for the purposes of identifying potential unexploded ordnance. There will also be a small amount of debris recovery required depending on what is found during the investigations.

The work is estimated to take approximately 25 days, finishing on approximately the 11th of July 2025, subject to weather.

Works are being undertaken under an approved Marine Licence from the Marine Management Organisation (MMO) (L/2023/00211/2); the local MMO enforcement and compliance team are aware of the planned EGL2 survey work.

There will be no unexploded ordnance detonations performed; this is investigation works only. There will a Crew Transfer Vessel being utilised, shown in Table 2.

The Kingdom of Fife shall be monitoring VHF 16 during the scope of the works and shall also be exhibiting the correct day shapes and night lights for a vessel restricted in ability to manoeuvre.

The table below provides a summary of each Cardinal and Special Mark Buoy deployed at the SOWF array, including target coordinates in WGS84 Degrees Decimal Minutes and a description of top mark and lantern characteristics. The Demarcation Buoys will be deployed for a period of approximately three years.  

The table below provides a summary of the Met-ocean Buoys deployed at the SOWF Array.

Seaway 7 deployed a Wave Rider Buoy on the 01/05/2025 within the boundary of the East Anglia THREE Offshore Windfarm Array during the Monopile Noise monitoring campaign as referenced in EA3 NTM 026 - 2025 Monopile Installation (Noise Monitoring Buoy Deployment). The Wave rider Buoy will remain on station until the end of the project.

The Wave Rider Buoy is equipped with a flashing yellow light and has a range of four nautical miles.

Recovery and/or periodic maintenance of the Wave Rider Buoy will be notified via future Notice to Mariners

Survey scope: • Multibeam echosounder (MBES, hull-mounted): Norbit Winghead dual-head • Side-scan sonar (towed): Edgetech 4205 • Magnetometer (towed): Geometrics G-882 The vessel will operate around local tides, conducting 12-hour daily shifts and returning to Mostyn each day.  

An Offshore Fisheries Liaison Officer (OFLO) will not be on board; however, the Project Fishing Industry Representative (FIR) and Company Fisheries Liaison Officer (CFLO) are available to address any enquiries. Contact details for the FIR and CFLO are provided below.

In addition to the main survey works, infield calibration activities will be undertaken by the survey vessel Fugro Valkyrie on Saturday 14 June and Sunday 15 June 2025. These calibration operations will occur outside of the proposed Mona Landfall Geophysical Survey Area, within two separate calibration areas shown in Figure 1.

Coordinates of these dedicated calibration area are provided in Table 2.

These calibration operations form part of standard survey preparation and will be completed ahead of the planned geophysical survey operations within the Mona Landfall Geophysical Survey Area.

Service of the 12 Passive Acoustic Monitoring (PAM) stations that have been deployed on the sea bed, in and at locations around the East Anglia THREE Offshore Windfarm Area.

There is an exclusion zone of 250m around each PAM station, all marine traffic is advised to abide by the 250m safety zone and navigate with caution at all times.

An additional 5 PAM stations have been deployed in positions found in the attached NTM 035-2025. 

For further information regarding PAM station , please see attached East Anglia Three Notice To Mariners 035 - 2025.

The works will consist of the excavation of 2 cable trenches and the installation of 2 stainless steel export cable ducts, once the ducts are installed the trenches shall be backfilled. Two buoys shall be temporarily deployred to delineate the work site. These works shall include diving operations, please see attached Notice to Mariners for further information.

A scheduled service from an assigned pool of Platform Supply Vessels providing supplies to the Offshore Converter Platform & JUV until further notice.  Those nominated vessels are:

• Dina Merkur;
• Dina Scout;
• Dina Supporter;
• Dina Supplier;
• FS Crathes;
• Bos Pool;
• Bos Base;
• Highland Knight - Circa 16th June 2025 (TBC)

All vessels will be arriving from non UK Ports throughout.

An eight legged jacket with 8 driven pin piles has been installed as a foundation for the OCP followed by the OCP itself.

The Sofia Offshore Wind Farm Boundary Co-ordinates where the works will take place are provided below.  All non-project vessels are requested to remain outside this area.

Mariners are requested to remain where possible 500m from vessels. During these works, SOVs will have restricted manoeuvrability and shall also be exhibiting the correct day shapes/ lights and flag for vessels engaged in diving operations and restricted in ability to manoeuvre.

Emergency Response & Rescue Vessel

The EERV Putford Protector is supporting the commissioning phase of the Offshore Converter Platform, providing close standby cover as required during overside works.

Service Operation Vessels

The Service Operations Vessel (SOV) “Rem Power” & Daughter craft “Rem Transporter” continues to support the SOWF project throughout the construction of the offshore windfarm.

SOVs shall be transiting to / from the Sofia Array and the port of Blyth / Sunderland throughout this period.

Crew Transfer Vessel

The Crew Transfer Vessel (CTV) “MHO Balder” commence operations at the Sofia OWF.

All vessels can be contacted on VHF 16 for further information as required reference proximity / nearby operations etc.

The vessels will be limited in manoeuvrability therefore, vessels working in the area should proceed with caution and alert the vessel within 1NM from the cable ship during operations and all activity should remain clear 250m either side of the vessel, 500m corridor in total.

For a further breakdown of operations, please don't hesitate to get in touch.

See detailed map on our bulletin website

Please be advised that Moray Offshore Windfarm (West) Limited (Moray West) are planning to commence subsea Remotely Operated Vehicle (ROV) repairs on the export cable from OSP1, which is expected to take no longer than 3 days.   The area of Operation is shown in Figure 1 below and will be carried out using the Deep Cygnus vessel. Work is scheduled to start in week 28 (7th July 2025), with operations dependent to weather conditions on site.

Several confirmed unexploded ordnance items have been located during unexpoloded ordnance identification and mitigation works.

Inch Cape will promulgate any relocation, or disposal plans in due course, if further information is required, please contact the Duty Marine Coordinator on the number above.

Whilst the vessel will tow survey equipment, BBOWF do not require fishing gear to be relocated and can operate around static fishing gear present within the survey area.  

Survey Duration  

The survey is anticipated to commence 26 May 2025 (+/- 2 days pending vessel availability), and will involve 7 days total of operational survey time. To account for weather delays and all eventualities we would like to extend the validity of this notice to 31 July 2025. The survey will be undertaken by an X-Ocean USV. A support vessel will escort the USV from the active ports to clear water. Please note that although the vessel is uncrewed, it will be piloted remotely using 360 degree cameras and other navigational aids. Vessel details are included within the attached Notice to Mariners document.

Survey Tasks  

The surveys involve deployment of: 

• Multi Beam Echosounder; 

• Sub-bottom profiler; 

• Magnetometer; 

• Ultra-short Baseline; and, 

• Sub-bottom Profiler. 

All mariners are advised to keep a safe clearance distance of no less than 500m from the vessel.

See detailed map on our bulletin website

An Exclusion zone of 500 metres will be required around the vessel whilst the work scope is underway. Vessel : M/V Northern Storm Call Sign: MISA7

Works will be between turbine F04 and the Offshore Substation (OSS). Teams will mobilise on 17th June with works beginning 19th June. The work involves; de-burial and removal of existing cable, relaying of the new cable in the existing trench (or as close as practicable). The works are expected to take until the 10th of July depending on weather conditions. The current outline planning is as follows: Start Date: Subject to weather 17th June 2025.

For the safety of the working party and anyone in the vicinity of the works, mariners are requested to be vigilant if approaching the below listed locations and stay outside of 250m from the works operations at all times. Once the as-laid location of the cable is determined, it will be communicated to mariners through appropriate channels for updating on charts and plotters.

See detailed map on our bulletin website

The mooring system consists of a 15 m rubber cord, a 60 mm polypropylene rope, two floats, another 80 m of polypropylene rope attached to bottom chains (see Figure 2). Marine users should maintain a recommended 500 metre safe clearance distance from the buffer area shown in Figure 1 due to the risk of snagging or propellor fouling. Updates will be issued via a revised Notice to Mariners when available.

UPDATE: Further updates on recovery attempts will be issued via a revised Notice to Mariners when available. 

The Subsea Viking continues supporting the Inter Array Cable Installation works via Survey, Cable Burial, Rock Bag Installation Works, as required.

Service Operation Vessels

The Service Operations Vessel (SOV) “Rem Power” & Daughter craft “Rem Transporter”, Acta Centaurus (W2W) and Vestri Enabler (W2W) continues to support to the SOWF project throughout the construction of the offshore windfarm.

SOVs Acta Orion and Olympic Orion continue to support Inter Array Cable / prepping and termination works.

All vessels can be contacted on VHF 16 for further information as required reference proximity / nearby operations etc.

Vessels shall be transiting to / from the Sofia Array and the ports of Blyth & Sunderland throughout this period.

Crew Transfer Vessel

The Crew Transfer Vessel (CTV) “MHO Balder” continues operations at the Sofia OWF.

Mariners are requested to remain where possible 500m from these vessels, as they will have restricted manoeuvrability and shall also be exhibiting the correct day shapes/ lights.

The following table highlights WTG installation progress and next 7 day forecast.

Vessels operational during these works are as follows:

The exact finish date will be dependent on the prevailing weather conditions and work progress. Mariners are requested to remain where possible 500m from Construction vessels when exhibiting the day shapes / night lights for vessels restricted in their manoeuvrability.

Service Operation Vessels

The Service Operations Vessels (SOV) “Rem Power” & Daughter craft “Rem Transporter” continues to support to the SOWF project throughout the construction of the offshore windfarm.

SOVs shall be transiting to / from the Sofia Array and the port of Blyth / Sunderland throughout this period.

All vessels can be contacted on VHF 16 throughout as required. All vessels shall be operating to / from the Port of Hull and will be operational 24 hours / day.

Foundation Installation Works (Aeolus)

The Aeolus has commenced the Offshore Foundation Transport and Installation works within the Sofia Offshore Wind Farm Array. These works include the transport and installation operations of primary components, namely Monopiles, and secondary components, namely Main Access Platforms, Internal Platforms, Boat Landings and Upper Ladders.

Vessels shall be transiting to / from the Sofia Array and the ports of Blyth & Tyne throughout this period.

The following table highlights foundation installation progress and next 7 day forecast.

The Sofia Offshore Wind Farm Exclusion Zone coordinates, are shown below and included within the relevant NtM.  Mariners are requested to remain outside this Exclusion Zone.

Vessels are requested to pass at a safe speed and distance and fishing vessels are advised to remain outside of the areas identified.

Service Operation Vessels

The Service Operations Vessels (SOV) “Rem Power” & Daughter craft “Rem Transporter”, Acta Centaurus (W2W) and Vestri Enabler (W2W) continues to support to the SOWF project throughout the construction of the offshore windfarm.

SOVs shall be transiting to / from the Sofia Array and the port of Blyth / Sunderland throughout this period.

Mariners are requested to remain where possible 500m from vessels. During these works, SOVs will have restricted manoeuvrability and shall also be exhibiting the correct day shapes/ lights and flag for vessels restricted in ability to manoeuvre.

Crew Transfer Vessel

The Crew Transfer Vessel (CTV) “MHO Balder” continues operations at the Sofia OWF.

All vessels can be contacted on VHF 16 for further information as required reference proximity / nearby operations etc.

The ROV utilised for the GVI survey shall be capable of acquiring the following sub–surface data: • High–definition video data; • Proximity CP readings using ROV mountable CP probe; • Direct CP readings using ROV mountable CP probe. The objectives of the GVI survey of the OSP is to determine the physical condition of the sub– surface elements of the structures. This will include an assessment of: • Any damage and deformation; • Any debris; • The condition of protective coatings; • The amount of marine growth; • A visual inspection and record of all subsea anodes attached to the jacket structure; • The level of cathodic protection (CP); • Seabed scour (where applicable).

The GVI survey shall evaluate the extent of corrosion, identify any damage and assess the overall integrity of the primary and secondary steelwork elements, covering the following jacket segments and other structural components: • Jacket members in splash zone • All horizontal, vertical, diagonal structural members • Installed Galvanic anodes • Structural clamps and connections • Mud mat and leg pile scour All items and components/elements below are to be covered under the scope of this survey: • Corrosion damage in terms of wear and rust • Localised corrosion damage in terms of pitting holes and major cracks • Member severance or missing members • Member buckling • Member denting or any other plastic deformation

• Inspection of all J tubes and risers • Partial or full detachment of anode–cast system from the structure • Missing or damaged anodes • Presence of debris trapped within the structural members of the foundation • Evidence of scour around the foundations and/or J tubes • Evident excessive marine growth attached to the structure • Gross paint coating damage; flaking, blistering, etc. in the painted tubular members (where possible due to the expected attachment of marine growth) The inspection of the selected areas shall include but not be limited to the following checks: • Gross extent of fatigue damage. • Visual signs of surface breaking cracks initiation and growth. • Length of surface–breaking fatigue cracks

As part of the planned geophysical survey within the Outer Thames Estuary, we are committed to ensuring the protection and preservation of the marine environment in line with relevant regulatory and environmental standards. The Outer Thames Estuary is a vital ecosystem supporting diverse marine life, including species of fish, seabirds, and marine mammals, as well as hosting sensitive habitats such as sandbanks and saltmarshes. Therefore, strict measures will be implemented to minimize any potential environmental impacts. Here are the key legislative frameworks impacting geophysical survey operations in the marine environment: 1. Marine and Coastal Access Act 2009 2. EU Habitats Directive (92/43/EEC) 3. EU Birds Directive (2009/147/EC) 4. Environmental Impact Assesment (EIA) Directive (2011/92/EU) 5. UK Wildlife and Countryside Act 1981 6. Marine Strategy Framework Directive (2008/56/EC) 7. Outer Thames Estuary Special Protection Area (SPA). 8. International Maritime Organization (IMO) Guidelines Practical considerations for compliance include: 1. Marine Licensing and Permits 2. Environmental Impact Assessments 3. Habitat and Species Protection 4. Stakeholder Engagement 5. Monitoring and Reporting 6. Training and Awareness Survey operations are subject to a robust regulatory framework designed to protect the marine environment and ensure sustainable use of resources. Compliance with these regulations requires careful planning, comprehensive impact assessments, and proactive

1. 1. Area of operations:                                        WGS84

Latitude               Longitude

• A02 – Generator exchange          57° 13.420' N    2° 0.758' W
• B01 - Generator exchange           57° 12.948' N    2° 0.671' W

1.1.2 Schedule

DATE OF OPERATION START: 20/06/2025

TIMES OF OPERATION: 24hrs

LENGTH OF OPERATION: 2 weeks depending on weather

2 Jack up Operations / AOW NTM 041

2.1 Equipment

Work will be conducted from the Jack up vessel Apollo. Vessels are requested to remain 500m away from Apollo whilst she is deployed in the windfarm. Apollo will display the lights and shapes prescribed in the International Regulations for the Prevention of Collisions at Sea (COLREGS).

MMSI: 253586000

I.M.O: 9769764 

L.O.A: 89.32m

BEAM: 42.00m

DRAFT: 8.00m

This campaign will commence around 31st of May 2025 and continue until approximately 8th of June 2025. The works will be continuous, 24 hours a day. Charts of the DBC array area are provided below.

The operations include a single pre-lay grapnel run over the centre of part of the array cable routes prior to IAC installation by means of a grapnel train to mitigate the risk of encountering subsea obstructions such as discarded fishing gear, wires, etc. 

During operations, the MAINPORT GEO will be restricted in its ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessel will also transmit an Automatic Identification System (AIS) message. 

It is requested that all vessels maintain a minimum of 1.5Nm separation distance from the vessel and pass at reduced speed. Fishing gear or other equipment with seabed intervention should not be deployed when approaching the working corridor.

• THV Patricia will relocate the EA3 Special 4 Buoy and EA3 West 2 Buoy marking the boundary of the East Anglia THREE Offshore Windfarm Array.
• THV Patricia will perform maintenance on the EA3 East 3 Buoy marking the boundary of the East Anglia THREE Offshore Windfarm Array

The confirmed relocation positions of EA3 Special 4 Buoy and EA3 West 2 Buoy will be notified via future Notice To Mariners. For further information regarding demarcation buoy relocation and maintenance, please see attached East Anglia THREE Notice To Mariner 034/2025: Aids to Navigation – Demarcation Buoy Relocation and Maintenance.

The geophysical survey vessel, Geo Ranger is expected to arrive in the survey arera on or around the 19th of February with operations expected to continue until the end of April 25. The vessel shall deploy towed survey equipment, mariners are requested to provide Geo Ranger with at least 1000m clearance during survey operations. The fishing vessel Solstice will conduct static fishing gear scouting in relevant survey boundary areas.

The vessels will be limited in manoeuvrability therefore, vessels working in the area should proceed with caution and alert the vessel within 1NM from the cable ship during operations and all activity should remain clear 250m either side of the vessel, 500m corridor in total.

For a further breakdown of operations, please don't hesitate to get in touch.

The survey involves the drilling, sampling and coring of boreholes throughout the array areas. The vessel will be stationary at each borehole location for up to 3 days to allow the samples and cores to be taken from the seabed. 24 hour and 7day lookaheads containing details of the positions of Fugro Synergy will be provided.

An Offshore Fisheries Liaison Officer (OFLO) will not be present on board the vessel during the survey but the project Fishing Industry Representative (FIR) and/or Company FLO (CLFO) can be contacted with any specific queries.

Contact details for the FIR and CFLO are provided in the attached notice.

See detailed map on our bulletin website

Partrac Ltd., on behalf of Thistle Wind Partners would like vessels to note that there is 100m HMPE recovery rope connected to the anchor weight which may be suspended in the water column. All vessels are to avoid the area. There will be an attempt to locate and recover the line and anchor.

The following equipment will be recovered, maintained, and redeployed on the site:

• 1 x Subsea mooring
• 1 x Wave buoy
• 1 x Floating LiDAR (FLS)
• 1 x Guard buoy

Maintenance activities will include but not be limited to:

• Visual Inspection, testing and replacing components as required.
• Cleaning & regreasing
• Replace batteries.
• Data download

All vessels are requested to maintain a 500m exclusion zone around the location.

Please note that rock placement will cause a reduction of navigable depth, but this is unlikely to exceed a 10% reduction.  The actual positions of rock placement will be updated as part of the as-built information of the project.  

All Mariners are advised that the 2 Export Cables & 1 Fibre Optic Cable (all bundled) have been installed into the HDD ducts at the Sofia HDD Landfall. 

An MBES survey of the HDD trenches out to KP 3 was performed indicating the spoil heaps from 2023 back hoe excavation works have largely naturally dispersed. One spoil heap remains with a maximum height above the seabed of < 0.2 m and vessels are requested to leave a wide berth as identified for the nearshore exclusion boundary (HDD pits out to KP3) until further notice. 

Fishing vessels are requested to pass at a safe speed and distance and remain outside of the exclusion area identified. All vessels can be contacted on VHF 16 for further information as required reference proximity/nearby operations etc.

The table below also provides the position and description of any equipment/asset/item that will remain in place following demobilisation of the Ievoli Ivory.

See detailed map on our bulletin website

Simultaneous Laying and Burial will be conducted between KP4.0 – KP148.0, inspection operations will be performed at third-party asset locations where applicable. During operations, NKT Victoria will have restricted manoeuvrability as defined under COLREGs (International Regulations for Preventing Collisions at Sea, 1972). The vessel will display appropriate day shapes and lights and will transmit an Automatic Identification System (AIS) message. ‘NKT Victoria’ will monitor VHF Channel 16 and VHF DSC Channel 70 continuously throughout the operation.

Victoria is expected to mobilise from the port of Karlskrona, Sweden on 14/06/2025. It is currently anticipated that weather permitting, works will be conducted on a continuous basis (i.e., 24-hour working, seven days a week).

The works will continue over the winter. The vessel will further be assisted by the Walk to Work Vessel SUDRI ENABLER for the deployment of cable pull in teams. Shortly after the start of the cable installation, the Trenching Support vessel (TSV) C-INSTALLER will be mobilised to site for the burial of the installed cables. All works will be continuous, 24 hours a day. Charts of the DBB array area are provided below.

The cable lay vessel will deploy the inter array cable onto the seabed through her dedicated deck spread. The cable will remain exposed on the seabed till trenching works by C-INSTALLER are performed.

During operations, the VIKING NEPTUN, C-INSTALLER and SUDRI ENABLER will be restricted in their ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessel will also transmit an Automatic Identification System (AIS) message. 

Flintstone will start operations on 07th of June 2025 and will perform rock placement during multiple load-outs, finishing her scope around 15th of July 2025. Work will be continuous, 24 hours a day.

During operations, Flintstone will be restricted in their ability to manoeuvre, as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessel will also transmit an Automatic Identification System (AIS) message.

It is requested that all vessels maintain a minimum of 500m separation distance from the Flintstone and pass at reduced speed.

Abeko Server 2 will be positioned at the HDD locations to begin seabed excavation for pit and trench creation and will carry out spoil management activities along the trench. The Abeko Server 2 will be manned 24 hours on site, with the Afon Alaw providing support for barge movements and towing as needed. During operations, the Abeko Server 2 will be restricted in its ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessel will also transmit an Automatic Identification System (AIS) message. The Isle of Jura will deploy a four-point mooring spread, including chain clumps, ground and riser chains, mooring cans with yellow marker lights, and flashing sequences. An Alucat vessel will assist in connecting and disconnecting the Isle of Jura mooring lines to the mooring array.

The following equipment will be recovered, maintained, and redeployed on the site:

• 1 x Subsea mooring
• 1 x Wave buoy
• 1 x Floating LiDAR (FLS)
• 1 x Guard buoy

Maintenance activities will include but not be limited to:

• Visual Inspection, testing and replacing components as required.
• Cleaning & regreasing
• Replace batteries.
• Data download

All vessels are requested to maintain a 500m exclusion zone around the location.

Major component repairs are to be carried out on Beatrice Windfarn involving the use of a self propelled jack up (Blue Tern).

The work will be undertaken from the 30th of May lasting for approximately 8 weeks. The vessel will operate at six locations on the Beatrice Winfarm replacing the main bearings on WTG BE-A05, BE-D08, BE-F09, BE-F13 BE-G13 and BE-J10

This is to raise awareness that the Construction Buoyage within the Moray Offshore Windfarm (West) Limited (Moray West) site will be removed in June or July 2025. This Notice supersedes the previous version which anticipated removal of the buoyage in April or May 2025. The Construction Buoyage currently remains in place, with this document highlighting the new removal dates.

Partrac Limited (Buoyage Maintenance Contractor) are scheduled to be on location in the next couple of weeks, where this will be rectified.

Mariners are advised to give the location a wider berth until service and maintenanec works are complete.

RWE Renewables UK Wind Ltd at Rampion windfarm would like to inform mariners that we are carrying out the essential works to enable a cable replacement campaign within the Rampion OWF Area over the course of one to two weeks, depending on weather conditions. If works continue past this date, a supplementary Notice to Mariners will be released.

Works will be at F04 and the Offshore Substation (OSS). Teams will mobilise on 2nd June with works in the water expected to start on 7th June. The work involves; removal of cable protection systems from F04 and the OSS and installation of lifting bags to enable cable recovery in a future campaign.

The current outline planning is as follows:

Start Date: Subject to weather 2 nd June 2025.

For the safety of the working party and anyone in the vicinity of the works, mariners are requested to be vigilant if approaching the below listed location and stay outside of 500m from the works operations at all times.

*The height of external cable protection is expected to be 2.06 m between KP 163 & 164 (DBB cable crossing).The water depth at the crossing is 23.24m following rock placement this will result in a minimum under keel clearance of 21.18m and a water depth reduction of 8.9%* 

*The height of external cable protection is expected to be 2.06 m between KP 165 & KP 166 (SEAL pipeline crossing). The water depth at the crossing is 24.37m, following rock placement this will result in a minimum under keel clearance of 22.3m and a water depth reduction of 8.4%.*

Fishing vessels are requested to pass at a safe speed and distance and remain outside of the exclusion area identified.

The table below details the coordinates of project infrastructure to remain on the seabed following the Ievoli Cobalt’s completion of works. The mattresses are not expected to reduce navigable depth by over 5%.

Green Volt Offshore Windfarm Limited (GVOWL) will be carrying out a geophysical survey within the Offshore Wind Farm Site. The survey will be carried out by the Ramform Vanguard with mobilisation planned on the 25th May 2025 and is expected to be on location for approximately 4 weeks. During operations, the survey equipment will have a layback from the vessel of approximately 250m. Any vessels transiting or fishing within the area shown in Figure 1 should be aware of this extended layback and contact the vessel on channel 16 for further updates on deployed survey equipment.

Deployment of the geophysical survey equipment will occur during transit on the way to the survey area. There will be an SFF services OFLO onboard the vessel to assist with any offshore fishing communications during the campaign, including communications on the area of deployment to reduce risks of interactions with other sea users.

Marine Survey operations be conducted by the MINTAKA 1 and the White Ribbon Nearshore vessel and shall consist of Geophysical data acquisition using hull mounted and towed sensors. This is followed by a Benthic environmental campaign consisting of video imagery and in-situ grab sampling operations. Other vessels should maintain an appropriate and safe distance of 500 m when passing the Mintaka 1 and FPV Morven vessel(s) whilst undertaking operations and should pass at the lowest possible speed to avoid vessel wash effects. The vessel(s) will be working 24-hour operations and will display appropriate day shapes and lights during reduced visibility and night operations. The vessel(s) will also monitor VHF Channels 16 and 12.

All instrumentation is deployed at a single deployment location within the project site. The purpose of the instrumentation is to gather Metocean and wind data to inform the proposed Muir Mhor Offshore Wind Farm Project.

All instrumentation was deployed by Green Rebel from the Port of Aberdeen to the site in February 2023 via the vessel BB Ocean (IMO 9196503, MMSI 258825000). 

The FLS mooring comprises of a surface visible buoy moored to the seabed via a two-point mooring system constructed using a combination of rope and chain.  Two guard buoys are located at approximately 30m from the main FLS buoy in a North/South orientation, with the mooring spread covering an approximate 315m radius. There is also a seabed frame for current measurements contained within the overall deployment footprint, approximately 30m East of the main FLS buoy. Note: there are 2x orange polyform marker buoys located above the northern anchor position (detailed below) which will be removed during the first planned maintenance visit.

The FLS light characteristics are Fl (5) Y 20s with 5nm range. The guard buoys’ light characteristics are FI Y 5s with 3nm range and include a yellow St. Andrew’s Cross topmark. The FLS is designated as “Muir Mhor Floating Lidar” on AIS, with MMSI number 992351400.

Details of the surface visible buoy, guard buoys, seabed frame and mooring arrangement are provided in the attachments.

MARINE USERS are requested to maintain a safe clearance distance of 500m from all assets.

As part of the annual operations and maintenance of assets, geophysical surveys will be taking place within the Moray Offshore Windfarm (West) Limited (Moray West) site. The geophysical survey scope will include Multibeam Echosounder (MBES) of all buried inter array, interconnector and export cables, and MBES at a 300m2 area around all 60 monopiles.If any anomalies are identified, Side Scan Sonar (SSS) with USBL will be employed for further investigation along small parts of the cable routes. Survey equipment will be hull mounted with the exception of small areas where the SSS with USBL will be used, and this equipment will be towed.

Mariners are advised that, as of 2nd May 2025, Hornsea Three have identified and confirmed 13 pUXOs as cUXOs within the Hornsea Three array area, the coordinates of which are provided in Table 1 and shown in Figure 1. All vessels are requested to maintain the required safe distance (500m) as defined from the coordinates set out in Table 1 and Figure 1. The EOD works for the Hornsea Three array area, are expected to be undertaken in a separate campaign commencing in Q3 2025. 

During unexploded ordnance identification and mitigation works, an item of unexploded ordnance has been discovered off Gullane Bay, East Lothian. This large item is located at the coordinates shown below in table 1 and fig 1.

Inch Cape Offshore Wind has placed a 150m avoidance zone around the item and will promulgate any relocation, or disposal plans in due course, if further information is required, please contact the Duty Marine Coordinator, contact details in the attached notice to mariners

External Blade repair campaign across 7 location in N & S Galloper Windfarm

The Guard Vessel Tess will announce hourly Security messages on VHF CH16.

Repairs are to be organized via Trinity House.

Any notifications of repairs will follow in a future Notice to mariners.

For further information please reffer EA3 NTM 031-2025 Navigation Light failure and Out of position Buoy

Route clearance of out of service cables, boulders and debris will be performed between KP4 -KP148 of the East Anglia Three Export Cable Route & within the boundary of the EA3 windfarm array. Inspection operations will be performed at third-party asset locations.

Mattress placement at third-party asset crossing locations will be performed at 7 locations between KP25 – KP42 of the EA3 Export cable route

A Pre-Lay Grapnel Run will be performed between KP4 – KP148

During periods of operation, vessel Trym will be restricted in her ability to manoeuvre. All vessels are requested to keep a minimum safe distance of 1000m from the vessel and pass at a reduced speed, fishers are requested not to deploy gear within the 500m fishing gear exclusion zone. For further information, please see attached East Anglia Three Notice To Mariners 030-2025. 

ROV Inspections of foundations across 28 WTG locations

Permanent protection of the cable will be achieved insofar as possible by post-lay burial (trenching) operations, however alternative methods of protection, such as rock-bags or rock berms, may be required where burial is not possible at the OSP.

The works will be undertaken approximately between 09th of June 2025 and 12th of July 2025. The work will be continuous, 24 hours a day. Coordinates and chart of the route are provided below.

During post-lay burial operations, North Sea Enabler will be restricted in its ability to maneuver as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessel will also transmit an Automatic Identification System (AIS) message.

In the period between late pull-in operations until the cable has been permanently protected by means of burial or rock placement, the cable may be locally exposed on the seafloor and the construction working corridor will remain closed for any static fishing, anchoring or use of other equipment with seabed intervention. During this time the cable is sensitive to any external impact and constitutes a snagging risk for anchoring, fishing gear or other equipment with seabed intervention.

The offshore site survey of the proposed Morgan (Generation Assets) and Mona Offshore Wind Projects array areas, to be carried out by the Ocean Observer (detail in section 6 of the attached notice).

The vessel will be making a crew change in the next few days in Liverpool. The vessel is then expected to transit to the Morgan licence area on the 25th May 2025 to commence Geotechnical survey activities. The survey involves shallow geotechnical surveys using Cone Penetration Testing (CPT) and Vibrocores (VC).

Following Geotechnical surveys in the Morgan licence area, the vessel will transit to the Mona licence area to continue Geotechnical surveys. A further Notice to Mariners will be issued in advance of this activity.

Regular lookaheads of the vessel position will be provide by the project FIR.

The project Fishing Industry Representative (FIR) and/or Company FLO (CLFO) can be contacted with any specific queries. Contact details for the FIR and CFLO are provided in this notice.

The EGL 5 project will play a vital role in achieving the UK and Scottish Government’s net zero targets and significantly increase the UK’s capacity for clean, green renewable power. The project comprises a 2GW, 525kV High Voltage Direct Current (HVDC) connection between an offshore Scottish and Southern Electricity Networks – (SSEN) Transmission’s licensed area to the National Grid Electricity Transmission (NGET) Lincolnshire Connection Node, comprising ~525km of HVDC cable offshore, ~10km HVDC cable onshore and a HVDC converter station.

The EGL 5 marine survey works are being carried out by ‘Fugro’ with the Vessel MJM Enterprise. The survey will include environmental work to collect sediment samples underwater video footage and water samples for subsequent analysis.

The area of work, pertaining to this Notice to Mariners (NtM) is illustrated in Figure 1 and Table 1, with the survey and updated support vessel contact details found in Tables 2 and 3. Contact details for the project’s Fisheries Liaison Officers are detailed below. The marine survey activities for EGL 5 will commence from the 28 th May 2025. The survey is due to be completed in approximately 30 days, subject to weather. The survey will be able to operate around static fishing gear. Therefore, fishing gear clearance is not being requested.

All vessels are requested to pass at a safe speed and distance, approximately 500 metres where possible (COLREGs Rule 16 & 18) from the areas identified during marine survey operations. The survey vessel will be restricted in her ability to manoeuvre and shall deploy towed sensors during geophysical survey operations only. The survey vessels will monitor VHF Channel 16 at all times. Mobile contacts for the vessels are listed at the end of this NtM

The primary purpose of the guard vessels is to protect the exposed cable along the East Anglia 3 Export Cable corridor by monitoring and issuing warnings to marine traffic operating within 6Nm of the construction area with a Closest Point of Approach (CPA) < 1.5Nm. More specifically, the focus will be on those vessels with potential to be engaging in bottom contact activities such as fishing and anchoring, as these activities pose a risk not only to the exposed cable bundle but also to the vessels themselves. The guard vessels will be clearly marked and display a highly visible "GUARD" sign on each side. Exchange of vessels on site will ensure the relevant section of cable is never left unguarded. In sections where cable protection has been completed, guard vessels will be released, and sections will be opened up for fishing or use of other of equipment with seabed intervention. This may not necessarily be in a sequential order from shoreside outwards

See detailed map on our bulletin website

In 2025, four surveys are planned between May and July. These trips include two consecutive survey days with two days for travel to and from the survey area from a Dutch port. These trips are planned to take place on: • 19-22 May (survey days 20, 21) • 2-5 June (survey days 3, 4) • 16-19 June (survey days 17, 18) • 30 June - 3 July (survey days 1, 2) And a reserve week is planned as 7-10 July (survey 8, 9).

The vessels carrying out the work will be towing survey equipment and will be limited in their ability to manouvre. Other vessels are kindly requested to give this operation a wide berth with regard to both vessels and gear. The vessels will display the appropriate lights and shapes and will maintain a listening watch on VHF Channel 16.

NtM 002-2025 - Blade Inspections

Mariners are advised that on or around the 23rd April 2025 (weather depending), the Cardinal P will conduct a series of internal turbine inspections.   During the blade inspections, the vessel will be tied off in close proximity to the Turbines being inspected (within the 50m zone).  

This work will also involve external ROV inspection of 2 locations and will also be close proximity work to these locations (within the 50m zone) which is expected to start in June 2025 (dates to be confirmed.

NtM 003-2025 & NtM 004-2025 - Jack Up Operations

Mariners are advised that the Jack Up Vessel 'Wind Discovery' is expected to commence operations at the Triton Knoll OWF site conducting a series of construction activities. During these works there will be a 500m exclusion zone around each asset when worked upon.  The Wind Discovery will be supported by the Arabella Jane.

This campaign will be completed in 2 phases as follows: 

Phase 1: 28th April - 14th May 2025 

Phase 2: 17th June – 30th June 2025

NtM 005-2025 - Drone Inspections

Mariners are advised that the Master P is expected to commence operations at the Triton Knoll OWF conducting Drone Inspections on all assets. Whilst drone inspections are being conducted, the Master P will be tied off near the asset and within the 50m zone.

NtM 007-2025 - Cable Protection System (CPS) Stabilisation Campaign The campaign will commence on 27th May 2025 for approximately 50 days (weather depending), including visits to port to reload.

Rock bags will be placed at intervals or adjacent to each other, as required, along selected exposed cable lengths at each of the fixed structure (WTG and OSP) locations across the site, taking approximately 6 hrs at each location. A 500m clearance to the vessel and all fixed structure locations whilst major maintenance works are being undertaken is required. The vessel will be operating 24/7.

Mariners are advised that the following vessels continue to be active at the Triton Knoll Offshore Wind Farm (TKOWF) as outlined within previously issued NtM's:

Mariners are advised that all foundations monopiles have been installed and all inter-array and export cables have been installed.

Navigation Warning - 08th January 2021

Mariners are advised that the remnants of a Wave Rider Buoy sinker weight and partial rigging are located within the Triton Knoll Offshore Wind Farm Construction site at the following location;

53° 30.442N 000° 50.564E

It is advised that the partial rigging could potentially be floating up to 9.7m above the seabed, reducing the navigable safe water in the immediate area to 10m LAT.  Mariners are advised to avoid the indicated position by 250 metres.

Possible Dangers to Navigation - Properties of the polypropylene show that the rope is buoyant, this makes the line sensitive for thruster currents. Taking the site water depth into consideration (19.7m LAT) and the maximum expected height above seabed of the rope 9.7m the line is expected to be floating submerged at approximately -10m LAT. In addition, it is noted that over time sediments will be trapped between the fibres and the heavier rope may finally sink. The polypropylene rope may impose a risk to foul propellers / propulsion of vessels due to the buoyant nature of the rope. As the rope is submerged at a depth of ~-10m LAT the risk is considered minimum for vessels with a shallow draught (<5m) and medium for a vessel with a deeper draught (>5m). Over time sediments will be trapped between the fibres and the heavier rope may finally sink thereby reducing the risk to propellers/propulsion of vessels. The clump weight itself (chain) is expected to have sunk into the seabed and has no significant height above seabed. In addition, the edges of the clump weight are mostly rounded (chain), the risk the clump weigh imposes to fishing activities/gear is therefore considered to be minimal.

Navigation Warning - 16th March 2021

Mariners are advised that two UXO targets have been confirmed within the Triton Knoll Offshore Wind Farm Array.

Mariners are advised that the two confirmed targets are located within 20 metres water depth (LAT) and a 10 metre radius exclusion zone is required around each target.  The following table provides the coordinates and a description for each target.

See detailed map on our bulletin website

Geotechnical survey operations on the proposed Dogger Bank South site will be undertaken using the following vessels and their expected start and finish dates. 

As the vessels will be conducting geotechnical drilling operations using a dynamic positioning system, it is requested that all vessels operating within this area keep their distance, maintaining at least a 500 m exclusion zone, and pass at minimum speed to reduce vessel wash. 

A continuous listening watch will be conducted on VHF Channel 16 by all survey vessels. 

Operations will be conducted on a 24-hour basis.

See detailed map on our bulletin website

It should be noted that SSE Renewables are not requesting fishers to relocate gear - on this occasion the vessels will work around any gear on location. The survey work is being undertaken by Natural Power, utilising the Windcat 20 as the survey vessel (please see the updated notice to mariners attachment which provides further vessel details). 

Once mobilised the survey will have a four day total duration. To allow for weather delays the expected completion date of the subtidal benthic survey will be 07 April 2025, however to allow for weather downtime, this notice will remain in effect until 31 August 2025.

During the survey campaign, the vessel will deploy an underwater drop down video/camera and mini Hamon grab to gather data on the ecology of the seabed. No towed gear operations will be taking place. The vessel will be generally unrestricted in its movements and will adhere to normal navigation protocol. 

Updated Notice Information  - 16 April 2025

Following completion of drop down video survey, the survey team will return to undertake grab sampling on Friday, 18 April 2025 depending on weather suitability. The vessel will be Gaoth Na Mara, please see the updated notice to mariners for further details. 

This entails 4 key types of activity which includes:

1. Mattress Installation,

2. Route Clearance,

3. Debris / boulder removal

4. Pre-Lay Grapnel Run (PLGR)

Please see attached Notice to Mariners for more information.

•    This survey shall take place from 12th  of May 2025 to 3rd July 2025

• Contact details: Onshore FLO: phone: +44 (0)7926 41 88 20, email: OWPLFisheries@xodusgroup.com;
• Offshore FLO: phone +45 32 22 67 06
• Further contact details Luis McArthur: phone: +44 (0)7771 86 28 68, email: luis.mcarthur@westoforkney.com

• Name of vessel carrying out the work and towed equipment used: Connector (Call Sign: OYOJ2)
• Geotechnical Survey Equipment
• Ultra Short Baseline (USBL)
• Port of operation: Scrabster.

Transmission system operator Elia is building the Princess Elisabeth Island in the Belgian part of the North Sea. This artificial energy island is an extension of the electricity grid in the North Sea. It connects the future wind farms of the Princess Elisabeth Zone with the Belgian coast and creates new connections with neighbouring countries.

The energy island is built centrally in the Princess Elisabeth wind zone, approximately 45 km from the Belgian coast. Construction of the island will take several years. To ensure safety during the works, the Belgian government defined an exclusion zone within which only work vessels are allowed. This zone is marked by 4 cardinal buoys (ELI-N, ELI-E, ELI-S and ELI-W).

Seabed preparatory works took place in spring and summer 2024. The installation of the caissons started in April 2025 and will proceed untill autumn 2026. During the winter months, no installation works will take place. The exclusion area remains in force at all times.  

More information about the Princess Elisabeth Island is available on the Elia website: https://www.elia.be/en/infrastructure-and-projects/infrastructure-projects/princess-elisabeth-island. 

A total of 30 (thirty) sets of Passive Acoustic Monitoring (PAM) moorings have been deployed across an area approximately encompassing the Dogger Bank C array area boundary plus a 40km buffer, indicative coordinates are included below. The PAM moorings will remain in place for approximately 4 months before being recovered in July 2025.

The works will commence on the 05th of July 2023, continuing until approximately Q2 2024.  The works will be continuous, 24 hours a day.  A chart of the DBA construction area boundary coordinates and a table of WTG location coordinates is provided below. A running list of the completed WTG installations and the next locations to be installed is presented in the Weekly Notice of Operations.

During operations, the Voltaire will be restricted in its ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessel will also transmit an Automatic Identification System (AIS) message. 

During operations, a Statutory Safety zone of 500m radius will be in place around the Voltaire during the installation of WTGs.  The safety zone will be monitored by a guard vessel. The primary response will be to warn passing traffic of the ongoing works and any active safety zones, and to alert any vessels where an infringement may occur or has occurred. 

The works will commence on the 22nd April 2025, continuing until approximately Q4 2025. The works will be continuous 24 hours a day. A chart of the DBC construction area is provided below. A running list of the next locations to be installed, mono-piled locations and completed foundations are presented in the Weekly Notice of Operations.

The installed monopiles will be marked with temporary lighting with the following characteristics:

•           Flashing (Fl) Yellow (Y) 2.5 seconds (s)

•           IALA Availability Category 2 (not less than 99.0%)

•           360° visibility – up to two lights per structure may be used to achieve this

•           At least 2 nm range.

The temporary lighting will be removed prior to the installation of the transition piece and subsequent completion of the foundation

During operations, the HLV Seaway Strashnov and HLV Seaway Alfa Lft will be restricted in ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessels will also transmit an Automatic Identification System (AIS) message.

During operations, a Statutory Safety zone of 500m radius will be in place around the HLV Seaway Strashnov and HLV Seaway Alfa Lift.  The safety zones will be monitored by a guard vessel. The primary response will be to warn passing traffic of the ongoing works and any active safety zones, and to alert any vessels where an infringement may occur or has occurred.

The works will commence on approximately the 15th of May 2025, continuing until approximately 11th of September 2025. The works will be continuous 24 hours a day. A chart of the DBC construction area and the installation location is provided below.

During operations, a Statutory Safety zone of 500m radius will be in place around the HEA Hydra for the duration of the Commissioning phase of the DBC OSP. Vessels are requested to maintain a minimum safe passing distance of 1km from the HEA Hydra during the operation.

The Platform Supply Vessel (PSV) FS Balmoral will support the HEA Hydra, carrying out regular supply runs to the offshore site.

During the Commissioning phase, there will be a requirement for rope access works to be carried out to the external parts of the OSP and Jacket. During these Over the Side (OTS) works the Dogger Bank OWF Guard vessel Jacobus will act as the Emergency Response Rescue Vessel (ERRV).

Major Maintenance works will be carried out to replace an inter-array cable on Beatrice Windfarm involving the use of a cable repair vessel (North Sea Enabler). This work will be undertaken from the 14th of May lasting until July 31st. The vessel will operate at one area on the Beatrice Windfarm.

Work will involve the removal of the existing inter-array cable and replacement. The cable will be laid within the existing trench as far as reasonably practicable using a control flow excavator. It is expected that the trench will naturaully backfill, and caution should be excersised during this time over the area. Further details will be provided at a later date regarding a guard vessel over the exposed cable.

See detailed map on our bulletin website

Please be advised that Aspect Land & Hydrographic Surveys Ltd (on behalf of SHEPD) will be undertaking subsea surveys in the Outer Hebrides marine area. Please refer to Figure 1 that highlights the survey area. The surveys are scheduled to commence on the week commencing Monday 12th May 2025, and be completed by August 2025.

Given the different conditions and water depths anticipated at each site, a range of vessels will be available for the project.

Start dates and anticipated durations listed against each individual location in the attached NtM.

LOCATION DETAILS

The survey corridor is noted in the attached NtM for information. Equipment calibration operations may take place out with the defined corridor and these areas will be chosen so as not to interfere with fishing / marine traffic activity.

VESSEL DETAILS

The vessels conducting these works will be restricted in their ability to manoeuvre and will display the appropriate lights and shapes.

Other vessels are requested to pass at a safe speed and provide a minimum clearance of 500m (COLREGs Rule 16 & 18) during marine operations.

All vessels will monitor VHF Channel 16 throughout survey operations. Mobile contacts for the vessels are listed at the end of the attached NtM.

Overview 

Mariners are advised that SSE Renewables will be returning to Berwick Bank Wind Farm area to continue Geotechnical survey work. The survey will be within the proposed Berwick Bank Wind Farm site boundary (see Figure 1 within the attached notice to mariners,  respective co-ordinates are listed in Table 1).   

It should be noted that SSE Renewables are not expecting fishers to relocate gear - on this occasion the vessel(s) will aim to work around any gear on location. A scouting/guard vessel will operate ahead of the survey vessel/s to ensure that this can be achieved. 

The survey work is being undertaken by Fugro and will be conducted by multiple vessels. The scouting/guard vessel will be the Courage or the GV Reaper. 

Updated Information - 08 April 2025

The Gargano is due to complete Cone Penetration Testing operations on the site by 13 April 2025. The Quest vessel, owned by Fugro, will commence a borehole campaign on the site starting 21 April 2025 at the earliest. The guard vessels will continue to be either the Courage or the Reaper alternating approximately every 21 days. Please see the attached Notice to Mariners for the vessel details.   

Update Information - 24 April 2025

The Gargano (operated by Fugro) completed Cone Penetration Testing operations on 12 April 2025. The Quest vessel, operated by Fugro, will commence a borehole campaign on the site starting 25 April 2025 at the earliest. A third vessel operated by Fugro, named RS Alegranza (formerly Wind of Pride) will support on the survey campaign for up to one week on site, commencing work on 30 April 2025 at the earliest.

The guard vessels will continue to be either the Courage or the Reaper alternating approximately every 21 days. Please see below for vessel details.  We would like to extend the validity of this notice until 30 September 2025. 

The exposures are present intermittently across all four cable routes as shown below/on the map.

Application for licence to remediate exposures has been submitted. Fishermen are requested to stay well clear.

A total of 32 construction boundary demarcation buoys will remain in location until the windfarm construction activities have been completed and handed over to the Operations and Maintenance teams.

Once the permanent Aids to Navigation (AtoN) have been installed on the WTGs, Trinity House will approve the permanent AtoN and the boundary buoys will be removed.

If anyone finds a buoy that is off station or encounters a buoy location where it is not functioning or is missing, they should report this to the Dogger Bank Duty Marine Coordinator as soon as possible.

Mobilisation of the Njord R, Ask R and USS 202 is anticipated from 24 April 2025 on site to commence pre-sweeping activities from 28 April 2025 onwards. The full scope of works are anticipated to take 5-6 months (weather dependent). Work is carried out from KP 78.9 (51º 48.2’ N 01º 38.0’ E) to KP 199.1 (52º 23.6’ N  02º 45.9’ E). Pre-sweeping activities between KP 78.9 to KP 145 are anticipated to be completed between 28 of Apr and beginning of June (weather dependent, it can take longer).

All vessels involved in operational activities will exhibit appropriate lights and day-time shapes prescribed by the International Regulations for Preventing Collisions at Sea, relative to operations. The vessel will also transmit an Automatic Identification System (AIS) message.    

Mariners are advised about Marine Survey Works for the Eastern Green Link 5 Project (EGL5).

EGL5 Project will play a vital role in achieving the UK and Scottish Government’s net zero targets and significantly increase the UK’s capacity for clean, green renewable power.

The project comprises a 2GW, 525kV High Voltage Direct Current (HVDC) connection between offshore Scottish and Southern Electricity Networks – (SSEN) Transmission’s licensed area to the National Grid Electricity Transmission (NGET) Lincolnshire Connection Node. This comprises ~585km of HVDC offshore cable and in Lincolnshire, ~10km HVDC onshore cable and an HVDC converter station.

The EGL5 marine survey works are being carried out by ‘XOcean’ with Remotely Operated Vessels (ROV’s) XO06, XO16, XO17, XO19, XO23, X026, XO27, and support vessels ‘Elysse II’, and ‘RLM CERBERUS’. The survey will include non-intrusive geophysical work to collect bathymetric data, seabed imagery and sub-bottom imaging.

The area of work pertaining to this Notice to Mariners (NtM) is illustrated in Figure 1 and Table 1, with the survey and updated support vessel contact details found in Tables 2 and 3. Contact details, including the project’s Fisheries Liaison Officers are detailed below.

The marine geophysical survey activities for EGL 5 will commence from the 23rd April 2025. The survey is due to be completed by the end of June 2025, subject to weather.

The survey vessels shall be unmanned vessels/ uncrewed surface vessels (USVs) and will be able to operate around static fishing gear. Therefore, fishing gear clearance is not being requested.

All vessels are requested to pass at a safe speed and distance, approximately 500 metres where possible (COLREGs Rule 16 & 18) from the areas identified during marine survey operations. The survey vessels shall operate without any towed equipment and remain fully manoeuvrable during survey activities The survey vessels will monitor VHF Channel 16 at all times. Mobile contacts for the vessels are listed at the end of this NtM.

Rock berm installation has been installed to an average height of approximately 1.6m above seabed level, which represents and average reduction in depth at Lowest Astronomical Tide (LAT) of approximately 6%.

The survey involves the drilling, sampling and coring of boreholes throughout the two Array Areas. The vessel will be stationary at each borehole location for 1 to 3 days, depending on borehole depth, to allow the samples and cores to be taken from the seabed. 24 hour and 7-day lookaheads will be provided, containing details of the positions of Horizon Geodrill.

An Offshore Fisheries Liaison Officer (OFLO) will not be present on board the vessel during the survey, but the project Fishing Industry Representative (FIR) and/or Company FLO (CLFO) can be contacted with any specific queries.

Contact details for the FIR and CFLO are provided in attached.

The remaining FLiDAR is scheduled for removal in November/December 2025, inclusive of any delays due to adverse weather conditions. An accurate removal date, along with vessel details for the operation, will be provided in the next update in due course.

Norside Supporter Will be Bolting and Grouting 95 monopiles and transition pieces at the WTG locations set out in section 2.2 of this document. It is currently anticipated that weather permitting, offshore works will be carried out on a continuous basis (i.e. 24-hour working, seven days a week)

Positions for both North & South weather buoys are identified in the attached Notice To Mariners 005 -2025. There will be periodic maintenance for both weather buoys during construction of EA3.

There is an exclusion zone of 100m around the weather buoys, mariners are  advised to abide by the 100m safety zone and navigate with caution at all times.

Please be advised that Moray Offshore Windfarm (East) Limited (Moray East) are planning to undertake geophysical surveys within the site boundary (Table 1 and Figure 1). Survey operations will be carried out by the Geosurveyor XI which is expected to arrive at site circa 18th April for 1 day then 1st June for 41 days (inclusive of weather downtime). The survey will take place within the red boundary in Figure 1.

The geophysical survey scope will include Multibeam Echosounder (MBES), Side Scan Sonar (SSS) of all buried cables and a 300m2 area around jackets shown in The coordinates of the work site boundary are presented in the below Table 1.

Table 1: Moray East Site boundary

1. General Safety Advice

Please be aware that, during the survey activities, by virtue of its mode of operation the vessel (Geosurveyor XI) will be Restricted in her Ability to Manoeuvre (RAM) as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972, Rule 3). Masters of vessels are therefore requested to maintain their vessels and gears at a minimum safe passing distance from the vessel of 500 metres when it is undertaking work and showing the appropriate shapes and lights in accordance with COLREGs Rule 27.

In order to not compromise the safety of the Survey Vessel, their crew, and their ability to undertake its contracted works, fishermen who have static fishing gears deployed within 500 m from the WTG where survey activities are planned (see Table 1 and Figure 1) are requested to provide the coordinates of such deployed gears in DMS and details of whether the surface markers used are visible at all states of visibility to Alex Winrow-Griffin (Brown & May Marine) using the contact information below (Section 58 of the Merchant Shipping Act 1995).

Fishermen who have static gears deployed beyond 12 nm are reminded that static gear must be marked in accordance with Commission Implementing Regulation (EU) No. 404/2011 (https://www.gov.uk/guidance/marking-of-fishing-gear-retrieval-and-notification-of-lost- gear#marking-of-fishing-gear)

1. Contact details

The following contact can provide more information if required. Please note that specific queries can also be addressed to the relevant vessel or shore-based representative.

As part of the annual operations and maintenance of assets, general visual inspection of the asset foundations and geophysical surveys will be taking place within the Moray Offshore Windfarm (West) Limited (Moray West) site.

Asset foundation inspections will be carried out by the Manor Vulcan which is expected to arrive at site circa 9th April for 1 day, returning on 12th June for 78 days

Scope of work includes the General Visual Inspection (GVI) of Wind Turbine Generator and Offshore Substation Platform foundation assets across the site including the transition piece, monopile, cable protection system and scour protection. The inspections shall be carried out through use of an Unmanned Aerial Vehicle (UAV) for above water works and a Remotely Operated Vehicle (ROV) for below water works. The work will be performed from the Manor Vulcan.

AIS - no AIS data for HS1, HS2, HS4 and HS5 - fault finding and repair to be conducted at earliest opportunity.

HS1 and HS4 - Nav aid lighting on the WTGs is faulty - fault finding and repair to be conducted at earliest opportunity.

HS1 has fault aviation lighting - fault finding and repair to be conducted at earliest opportunity.

The geophysical survey will be undertaken within the Survey Area, with a 1.5 km buffer around it to allow the survey vessel to turn between survey lines (please refer to the map in the ‘Activity Area’ section below which displays both the Survey Area and 1.5 km buffer).

The MV Mainport Edge will use a range of acoustic and sonar sensors to investigate the seafloor and sub-surface, these will either be attached to the hull of the survey vessel or towed by the survey vessel for the duration of the geophysical survey.

The MV Mainport Edge will transmit regular automatic transmission system messages during the geophysical survey.

The westerly exposure is 7m long, the easterly is 4m long.

Crew Transfer Vessel NR Rebellion will provide assistance during the construction phase of the East Anglia Three Offshore Windfarm Array and will make regular transits between East Anglia Three CDM and the ports of Lowestoft and Great Yarmouth. Outer Thames Estuary Special Protection Area (SPA) As required under Deemed Marine License Condition 13(1)(c)(v) to minimise disturbance to red throated diver in the Outer Thames Estuary Special Protection Area (SPA), during construction of EA3. It is anticipated that vessels which are transiting to Lowestoft and Great Yarmouth ports, such as for crew transfer operations, will transit through and/or in proximity to the Outer Thames Estuary SPA. These areas shall be as far as practicable be avoided during transit from 01st November to 31st March

Outer Dowsing Offshore Wind (a joint venture between TotalEnergies, Corio Generation and Gulf Energy) are conducting a 3.5 month offshore geotechnical survey between 28th April and 08th August 2025 using the vessel Dina Polaris call sign: CQOF. The survey vessel shall be conducting geotechnical boreholes at various locations within the proposed offshore wind farm area. The vessel will typically spend one to two days static at each sample location within the area so please allow a safe distance.

Company: Outer Dowsing Offshore Wind

Contractor: Geoquip Marine Operations AG

Survey Vessel: Dina Polaris

Survey Vessel call sign: CQOF

Earliest Start date: 28th April 2025

Latest Finish date: 8th August 2025

On behalf of Inch Cape Offshore Ltd, N-Sea will commence seabed preparation activities within the wind farm site boundary and its export cable corridor on or around the 30th of March 2025.

Seabed preparation will include the relocation of any boulders and the identification and mitigation of any unexploded ordnance (UXO) which may affect the installation of offshore structures, inter-array cables and export cables.

The boulder relocation vessel, FS Aries is expected to arrive at the work site on or around the 30th of March with the UXO identification & mitigation vessel,

4-Winds arriving on or around the 4th of April.

Works are expected to be completed by November 2025.

The survey work consists of 3 different phases with all 3 vessels mobilising at different periods and will operate simultaneously however the total expected duration for all the works with all 3 vessels is approx. 100 days. Operations will comprise the following phases:

- Phase 1 – Nearshore and Offshore Surveys comprising a towed array of hydrographic survey equipment approx. 150m in length within the boundary coordinates outlined within this notice. This phase is expected to last approx. 74 days in total.

- Phase 2 – Environmental Survey within the same boundary coordinates at the later end of the period comprising various stationary elements. This phase follows on from Phase 1 and is expected to last approx. 12-15 days in total.

- Phase 3 – ROV survey within the same boundary coordinates at the later end of the period – most likely to be the same vessel as in Phase 2. This phase follows on from Phase 2 and is expected to last approx.. 14-18 days in total.

Both offshore vessels will operate 24hrs whilst the nearshore vessel will operate 12hr days exclusively within the 12nm zone.

Seaway Ventus will install 95 monopiles and transition pieces at the WTG locations set out in attached East Anglia Three Notice To Mariners 012 /2025. During the monopile and transition piece installation campaign, all vessels are requested to keep a 500m safety distance from the Seaway Ventus. It is currently anticipated that weather permitting, offshore works will be carried out on a continuous basis (i.e. 24-hour working, seven days a week)

During operations, the ‘Seaway Ventus’ will have restricted manoeuvrability as defined under COLREGS (International Regulations for Preventing Collisions At Sea, 1972). They will display the appropriate day shapes and lights and will transmit an Automatic Identification System (AIS) message.

See detailed map on our bulletin website

Sheringham Shoal windfarm will be undertaking additional works outside of scheduled maintenance commencing 20th March 2025. This work will involve the retrofit of the Push on Plates (PoPs) on 80 WTGs and the 2 Offshore Substations to allow “Walk to Work” operations to be completed via Service Operation Vessel (SOV).

The project is expected to last for approximately 16 weeks and will require 1 additional CTV vessel to be present in the windfarm for this period. However, there should be some expectation of weather delays therefore some contingency should be applied to the planned dates.

The Crew Transfer Vessel (CTV) Manor Victor is contracted for normal service operations will support in the field with crew transfers and additional transport.

The additional work scope and vessel should not cause any impact to local vessels or activities, but normal due care should be taken within the boundary of the windfarm due to increased vessel activity and work on turbines and offshore sub stations.

The geophysical survey will include Multibeam Echosounder (MBES)/ Backscatter, Side Scan Sonar (SSS), Magnetometer (MAG), Innomar sub-bottom profilers (SBPs) and an Ultra-short baseline (USBL) acoustic positioning system will be used to calculate the position of underwater targets.

The geophysical survey works will be conducted by the following 3 survey vessels.  “Ocean Endeavour”, “Titan Endeavour”, and “Ocean Researcher” as well as one support vessel “GV Jacoba”. The mobilisation of the first geophysical vessel will start 14th March 2025 and the survey operation will commence from around 1st April 2025. The works are expected to last approximately 180 days, including weather downtime. The exact survey dates are subject to mobilisation time, weather and work progress.

The guard vessel ‘Tess’ will monitor vessel traffic in and around the East Anglia Three Offshore Windfarm 24hours a day, 7 days a week. The vessel will broadcast regular navigational warnings and will contact any non-project vessels they believe could cause potential hazards, risk of collision, or cause an interruption to project vessels or assets. She will be monitoring VHF Channel 16 and VHF DSC Channel 70 continuously throughout the operaton.

East Anglia THREE will be a large offshore wind farm, located 69 km off the Norfolk coast. With a projected capacity of approximately 1400MW, the wind farm shall supply electricity to approximately one million UK homes. Onshore construction for the project started in July 2022. 

By use of multiple specialized offshore vessels,1 Offshore Convertor station (OFCS) & 95 offshore wind turbine generators (WTGs) will be installed within the East Anglia Three site boundary along with the associated inter array and export cables. The generated power will be transmitted via an installed External Cable (EC) from the OFCS to a shore side substation located in Bramford. 

See detailed map on our bulletin website

Echosounder and clump weight

A seabed mounted frame (1.6 x 1.6 m x 0.8 m, 350 kg) with echosounder inside was deployed in approx. 91 m water depth on 19th July 2024. The frame was connected with a ground line to a mooring weight/anchor (2,000 kg), which was attached to a standard spherical blue surface marker buoy with a riser to mark its position. The surface marker buoy was not visible at time of recovery operations so is thought to have broken free from the clump weight. 

Photos of the echosounder frame, clump weight and surface marker buoy are attached.

The frame was designed to be overtrawlable however the clump weight was not so could pose a snag hazard. 

FLiDAR 1 anchor

In April 2024, the FLiDAR buoy broke its mooring; the clump weight for this was made up of several ~1m long lengths of heavy chain bound together with a smaller chain (photo of similar set-up attached as an example). The buoy and mooring were recovered, and subsequent inspection onshore showed that the chain binding the links of heavy chain had come apart as the FLiDAR was dragged, leaving the heavy chain lengths on the seabed. These are expected to have sunk into the seabed sediment and/or have dispersed from original location. Consequently, these links of chain are not considered to pose a snag risk. 

Locations of these items are in table below but note that these are deployed locations and they could have moved/been dragged from these points. 

It is requested that mariners avoid activities which are likely to disturb the seabed within a 500m Radius of this location until the exposed export cable has been re-investigated. A further Notice to Mariners will be issued to confirm the course of action we will be taking to rectify this. Please note that the standard safety rules apply when fishing in or near wind farms and associated cables. All mariners are requested to make themselves aware of their obligations for conducting activities over buried and protected cables under International and UK Cable (Sub-sea) Protection Legislation. 

Mariners are reminded to navigate with caution and keep continued watch on VHF Ch. 12 / 16 when navigating the area. The Marine Coordination Centre will be responsible for monitoring and policing the Safety Zone and can be contacted directly for advice. Further information on the risks to fishing adjacent to subsea cables can be found in Weblinks: www.kis-orca.eu https://www.seafish.org/article/kingfisher-bulletin 

Please be advised that the subsea survey carried out in 2020, identified seven cable routes with 10 exposures in total. The below table provides the locations of the identified exposures.

As cable exposure is a known risk at Galloper and across the offshore wind industry, we would remind Mariners of the safety information found on the KIS-ORCA website ‘The risks of fishing near cables and renewable energy structures. To avoid crossing cables when towing equipment follow the cable corridors- locations of the cables can be found on the Galloper awareness charts via KIS-ORCA.

Please be advised that the subsea survey carried out in 2020, identified seven cable routes with 10 exposures in total. The below table provides the locations of the identified exposures.

As cable exposure is a known risk at Galloper and across the offshore wind industry, we would remind Mariners of the safety information found on the KIS-ORCA website ‘The risks of fishing near cables and renewable energy structures. To avoid crossing cables when towing equipment follow the cable corridors- locations of the cables can be found on the Galloper awareness charts via KIS-ORCA.

See detailed map on our bulletin website

The geotechnical survey works will be conducted by the following 3 survey vessels.  “Connector”, “Geoquip Saentis”, and “Geoquip Seehorn” as well as one support vessel “GV Independent”, starting from 10th February 2025. The works are expected to last approximately 170 days, including weather downtime. The exact survey dates are subject to mobilisation time, weather and work progress.

Hornsea Four does not request any fishing gear to be cleared as the proposed activities intend to work around any fishing gear encountered. If gear is directly obstructing a sample location, Orsted may request gear relocation though this will be avoided where possible.

The contents of this notice are based upon our current understanding of Hornsea Four’s requirements

The operations will include visual inspections and maintenance at installed WTG foundation locations. During operations, the Edda Boreas will be restricted in its ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessel will also transmit an Automatic Identification System (AIS) message. It is requested that all vessels maintain a minimum of 500m separation distance from the Offshore Supply Vessel and pass at reduced speed. Fishing gear or other equipment with seabed intervention should not be deployed when approaching the working area.

See detailed map on our bulletin website

See detailed map on our bulletin website

See detailed map on our bulletin website