News

Please be advised that during geotechnical survey operations within the Morgan Array Area the vessel Ocean Observer dropped a geotechnical vibrocorer on the seabed. The height of the dropped vibrocorer is approx. 5m and is located in mean average low water depth of 40m. 

The approximate location of the dropped vibrocorer on the seabed is marked by a tethered Norwegian buoy appended with the vessel Ocean Observers IMO number 8511275 (Table 1). 

The Titan Endeavour will undertake a reconnaissance survey to assess the best method for recovery on Saturday 19th July. It will survey using an ROV, and will be completed by 1700 that day. 

This survey is not a recovery attempt; it will provide information about Vibrocorer (VC) conditions and the best method for the recovery that will take place at a later date (updates will be notified in due course) 

See detailed map on our bulletin website

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 July 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.

The Austri Enabler is expected to commence operations on or around 31st July 2025.

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.

The CTV “MHO Boreas” is expected to commence operations on or around 1st August 2025

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

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.

The Austri Enabler is expected to commence operations on or around 31st July 2025.

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” continues operations at the Sofia OWF.

The CTV “MHO Boreas” is expected to commence operations on or around 1st August 2025

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.

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) continues to support to the SOWF project throughout the construction of the offshore windfarm.

SOVs Dos Notus (W2W), Acta Orion and Olympic Orion continue to support Inter Array Cable / prepping and termination works.

The Austri Enabler is expected to commence operations on or around 31st July 2025.

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.

The CTV “MHO Boreas” is expected to commence operations on or around 1st August 2025

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 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.

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 Dos Notus 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.

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

The Geophysical UXO survey will take place on or around 15th July  – 15th August  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.

Inter Array Cable Installation

The Cable Lay Vessel (CLV) VIKING NEPTUN will perform the remaining inter array cable installation works with the commencement around 18th of July 2025. The vessel will further be assisted by the Service Operation Vessel (SOV) NORSIDE CETUS for the deployment of cable pull in teams. All works will be continuous, 24 hours a day. 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 until trenching operations commence in August/September 2025. During operations, the VIKING NEPTUN and NORSIDE CETUS 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 vessels will also transmit an Automatic Identification System (AIS) message

Offshore Substation Platform

The Service Operations Vessel (SOV) Grampian Tweed will carry out an annual maintenance programme at the DBB Offshore Substation Platform (OSP)

Geotechnical Drilling (boreholes) survey using a jack up barge and support vessels to evaluate underlying geology. The support vessels will be providing crew change and pushing services to the Shearwater Jack Up Barge

From 25/07/25 – 12/08/25

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 Ocean Observer is due to commence Geotechnical survey activities in the proposed Mona Offshore Wind Projects array area from 24th July onwards.

The vessel is continuing to carry out Geotechnical survey activities in the Morgan (Generation Assets) proposed array area currently and is estimated to transit to the Mona licence area to start Geotechnical survey activities from 24th July 2025. The Geotechnical survey activities undertaken by the Ocean Observer are estimated to be completed by 31st September 2025.

The survey involves shallow geotechnical surveys using Cone Penetration Testing (CPT) and Vibrocores (VC).

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 the attached notice.

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.

Site Survey operation.

Orkney VTS will be notified of all operations and movements.

Vessel will be transiting from Stromness harbour to the survey area and back to harbour.

Vessels are requested to maintain a safe distance of 400 meters from the stated coordinates submitted.

The Spiorad na Mara Floating LiDAR (FLiDAR) was successfully serviced and returned to its original position.  

Positions of the FLiDAR is illustrated in Figure 1 and coordinates listed in Table 1 of the attached notice. 

The remaining FLiDAR is scheduled for removal in March 2026, inclusive of any delays due to adverse weather conditions. An accurate removal date, along with vessel details for the operation, will be provided in due course. 

The section from the French TW to the landing at Cayeux-sur-Mer will be installed at a later date, yet to be confirmed. 

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

Leask Marine will be undertaking a MBES survey 0.23NM off-shore from Warbeth Beach, Orkney. Surveys will occur between 25/7/2025 and 05/08/2025. 

The location of the survey area are detailed in the attached NTM. Vessels are requested to give the works a wide berth.

See detailed map on our bulletin website

The works shall be carried out using Multi Beam Echo Sounder (MBES) and Remote Operated Vehicle (ROV) by three different vessels: 

• Scotia – From 12 Nautical Mile Limit out to the Sofia Offshore Array (Operating from Aberdeen). 
  • Approx. 5 Day Campaign;
• MJM Enterprise – From Landfall out to 12m LAT (Operating from Hartlepool). 
  • Approx. 3 Day Campaign.
• Atlantis Dweller – From 12m LAT out to 12 Nautical Mile Limit (Operating from Aberdeen). 
  • Expected on site, early August 2025 (Approx.5 Day Campaign).

There shall be no interaction with the seabed during the works. 

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

All vessels shall be monitoring VHF 16 during the scope of the works and shall also be exhibiting the correct day shapes  and night lights as required to determine any restrictions in manoeuvrability.  All vessels can be contacted on VHF 16 for further information as required reference proximity/nearby operations etc.

Previous Export Cable Route Construction Activities

Rock placement works 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.  

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. 

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.

The works shall be carried out using Multi Beam Echo Sounder (MBES) and Remote Operated Vehicle (ROV). 

There shall be no interaction with the seabed during the works. 

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

All vessels shall be monitoring VHF 16 during the scope of the works and shall also be exhibiting the correct day shapes  and night lights as required to determine any restrictions in manoeuvrability.  All vessels can be contacted on VHF 16 for further information as required reference proximity/nearby operations etc.

Previous Export Cable Route Construction Activities

*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%.

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.

Metocean instrumentation and a floating LiDAR system (FLS) have been deployed by Green Rebel within the boundary of the proposed Muir Mhòr Offshore Wind Farm Project site in the North Sea since February 2023.

See attached NTM.

This notice is to inform that Green Rebel intends to deployed (1) Floating LiDAR System (FLS) buoy at the OREC National Offshore Anemometry Hub (NOAH), approximately 3 nautical miles off the coast of Blyth, Northumberland for a minimum period of 3-months. 
The installation of the FLS buoy and associated single leg mooring system will aim to take place on Friday 25th July 2025. Additional notice will be provided prior to recovery, or any other offshore activities being undertaken.

Mariners are advised about Marine Survey Works for the Eastern Green Link 5 Project. 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 ~585km of HVDC cable offshore, ~10km HVDC cable onshore and a HVDC converter station.

Survey Information The EGL 5 marine survey works are being carried out by ‘GEOxyz’ with the vessel Provider. The survey will include a Triton XLX Work class Remotely Operated Vehicle (WROV). The survey will be carried out at specific locations where existing cables and pipelines are situated on the route as per table 1 below. The marine survey activities for EGL 5 will commence from 23 July 2025. The survey is due to be completed in approximately 20 days, subject to weather. The area of work, pertaining to this Notice to Mariners (NtM) is illustrated in Figure 1 and Table 1, with the survey vessel details found in Table 2. Project Contact details and Fisheries Liaison Officers Contact details in Table 3. The survey vessel 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. The survey vessels will monitor VHF Channel 16 at all times. Mobile contacts for the vessels are listed at the end of this NtM

On behalf of Inch Cape Offshore Ltd, the Offshore Energy Group Ltd. shall deploy the development site construction phase demarcation buoyage in line with the project Lighting and Marking consent plan.

The multipurpose construction support vessel Kingdom of Fife will commence the buoy deployment on or around the 14th of July 2025.

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.

Transition Piece (TP) Installation

The installation vessel HLV Seaway Alfa Lift will install the foundation Transition Pieces (TP) on the pre-installed Monopiles (MP) in the Dogger Bank C offshore windfarm construction area, commencing on the 19th of May 2025, continuing until approximately Q4 2025. The works will be continuous 24 hours a day.

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).

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

Construction Support Activities.  

The SOV Grampian Tees will carry out construction support activities at the Offshore Substation Platform in the DBC construction site and at various WTG locations.

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. 

There will be a total of nine vessels operating alongside the NKT Victoria: 

• VIPER - Call sign - 2EDS8 -MMSI - 235084238 

• CANBERRA - Call sign - 2EDS7 - MMSI - 235084237 

• TRISTAR - Call sign - 2FQW9 -MMSI - 235093497 

• TYPHOON - Call sign - 2DPX6 - MMSI - 235081064 

• DAKOTA - Call sign - 2FQW8 - MMSI - 235093496 

• CATALINA - Call sign - 2FQW6 - MMSI - 235093494 

• PHANTOM - Call sign - 2FBM3 - MMSI – 235089863 

The Isle of Jura will assist with operations and is expected to remain onsite. 

The Seafast don will conduct crew transfers from the Port of Harwich. 

For further information regarding export cable installation assisting vessels, please see attached EA3 NTM 039-2025 Export Cable Installation (Assisting Vessels)

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.

For futher information please reffer attache EA3 NTM 042-2025  Export Cable Dredging (Nearshore

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 10 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 68

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 Derwent 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.

Inter Array Cable Replacement

The Cable Lay Vessel (CLV) VIKING NEPTUN will replace a single inter array cable in the DBA Construction Site. Works will commence on 12th of July 2025. The vessel will further be assisted by the Service Operation Vessel (SOV) NORSIDE CETUS for the deployment of cable pull in teams. All works will be continuous, 24 hours a day. Charts of the DBA 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 until trenching operations commence in August/September 2025. 

During operations, the VIKING NEPTUN and NORSIDE CETUS 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 vessels will also transmit an Automatic Identification System (AIS) message. 

RWE Renewables UK Wind Ltd at Rampion windfarm would like to inform mariners that, owing to trenching vessel  availability, the essential works to replace a faulty cable within the Rampion OWF will require the new cable to be surface  laid on the seabed until a trenching vessel will be available (currently expected end of August).

The surface laid cable will be between turbine F04 and the Offshore Substation (OSS) along, or as close as practicable to,  the existing cable route. 

Owing to the safety and asset risks caused by accidental interactions with the surface laid cable, mariners are requested to be vigilant if approaching the below listed locations and to keep the area around the surface laid cable clear of any activities that may interact with the sea bed.

A guard vessel (M/V Theo) is expected to be on hand to support site in managing the risk and to inform other sea users in the area. This notice to mariners will be updated with the details of this vessel once secured and when the trenching availability window is clarified.

The vessel will further be assisted by the Service Operation Vessel (SOV) NORSIDE CETUS for the deployment of cable pull in teams. 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 until trenching operations commence in August/September 2025.  

During operations, the VIKING NEPTUN and NORSIDE CETUS 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 vessels 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 vessels and pass at reduced speed. Fishing gear or other equipment with seabed intervention should not be deployed when approaching the working corridor.

Works will commence on 12th of July 2025. The vessel will further be assisted by the Service Operation Vessel (SOV) NORSIDE CETUS for the deployment of cable pull in teams. All works will be continuous, 24 hours a day. Charts of the DBA 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 until trenching operations commence in August/September 2025.  

During operations, the VIKING NEPTUN and NORSIDE CETUS 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 vessels 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 vessels and pass at reduced speed. Fishing gear or other equipment with seabed intervention should not be deployed when approaching the working corridor.

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.

The ROV Survey operations for EGL 2 are due to commence on 12th of July 2025. The works are to be conducted within the 2 blocks (2 & 3) shown in Figure 1, and updated coordinates are detailed in Table 1, both given below. The works consist of an offshore vessel using the Smartsearch system and ROV to carry out geophysical survey for the purposes of identifying potential unexploded ordnance. The work is estimated to take approximately 8-10 days, finishing on approximately the 22nd of July 2025, subject to weather. These works are being conducted in accordance with Marine Licence MS-00009943 from the Marine Directorate Scotland. The relevant enforcement and compliance team within the Licensing Operations Team (MD-LOT) is aware of the scheduled EGL2 survey activities.

To inform the development of the Project, Mona Offshore Wind Limited intends to carry out a geotechnical investigation (survey) which is expected to commence in 2025, at the proposed Mona Landfall Survey Area (Figure 1). The geotechnical survey is expected to commence on the 17th July 2025, for an estimated total duration of 28 days. 

Please note that the licence for these works has not yet been granted and these works will not commence until the license is determined. 

The survey is proposed consist of up to 12 geotechnical boreholes below Mean High Water Springs (MHWS) up to 40 m below seabed (licensable marine activity).

For information only, additional tests and survey work include:

• Downhole in-situ testing;
• Geophysical surveys (completed June 2025). 

The downhole in-situ testing works are non-licensable activities under the Marine and Coastal Access Act. Where necessary these activities will be the subject of the appropriate exemption notifications.

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.

The vessel "Rollingstone" will be placing rock on the inter-array cables at the two Offshore Substations at Walney 1 and 2 wind farms and wind turbine generator E03 between 19 - 27 July (subject to weather delays).  A mandatory safety zone of 500m will be in place when the vessel is stationed next to the offshore infrastructure.

Mariners are advised that Transmission Capital Beatrice OFTO Ltd will be undertaking an export cable repair at approximately KP33 of CCT 2 (57.95900715 LAT, -3.04087088 LONG). Works will be carried out by NKT managed by Beatrice Offshore Winds Ltd – BOWL (acting as the principal contractor) using the dedicated cable lay vessel ‘North Sea Giant’ which is expected to arrive on site circa 5th July 2025 and remain on site until the 8th August.

Work duration is expected to be approximately 4-6 weeks.

A support vessel ‘Northern Victoria’ will be in site from 1st July and will transit between the work site and Aberdeen during the work period.

THV Galatea has relocated the EA3 West 2 Buoy to its original position. EA3 Special 4 Buoy has been relocated East of its original position. THV Galatea has also performed maintenance on the EA3 East 3 Buoy marking the boundary of the East Anglia THREE Offshore Windfarm Array.

The demarcation buoys will remain on station throughout construction of the East Anglia THREE Offshore Windfarm.

For futher information regarding East Anglia THREE aids to navigation, please see attached EA3 Notice To Mariners 041/2025: Aids To Navigation- Demarcation Buoys.

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

The works will commence on the 20th of July 2025, continuing until approximately the 20th of August 2025. The works will be continuous, 24 hours a day. A chart of the DBA Array Area is provided below.

During operations, the OLYMPIC TAURUS 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 OLYMPIC TAURUS and pass at reduced speed.

Geophysical Survey Operations:

The vessel will complete geophysical survey operations along the proposed Mares Connect subsea cable route, surveying a 500m corridor along the planned route in Irish waters. The vessel will be surveying using multibeam echosounder, side-scan sonar, magnetometer and sub-bottom profilers.

The side-sonar and magnetometer will be towed subsea at approximately 6m from the seabed, up to 4 times water depth (expected max tow 500m). One of the sub-bottom profilers will be towed behind the vessel with accompanying streamer at a distance of approximately 200-300m behind the vessel.

The closest point of approach to the vessel is 1000m due to towed equipment.

Environmental sampling operations:

The vessel will complete environmental sampling operations along the proposed Mares Connect subsea cable route, locations to be determined following the geophysical survey. This sampling would entail camera transects, grab sampling and CTD profiles.

The closest point of approach to the vessel is 500m due to overboarded equipment.

Geotechnical Sampling Operations:

The vessel will complete geotechnical sampling operations along the proposed Mares Connect subsea cable route, locations to be determined following the geophysical survey. This sampling would entail Vibrocore and CPT sampling.

The closest point of approach to the vessel is 500m due to overboarded equipment.

Please be advised that the vessel Ocean Observer has dropped equipment on the seabed which it is currently unable to recover during geotechnical survey operations within the Morgan Array Area.

The height of the dropped equipment is approx. 7m and is located in mean average low water depth of 40m.

At this time the location of the dropped equipment on the seabed is marked by a tethered Norwegian buoy appended with the vessel Ocean Observers IMO number 8511275.

The contractor plans to recover the dropped equipment in the future, however at this point the date a time of recovery is not yet known.

Geotechnical Drilling (boreholes) survey using a jack up barge and support vessels to evaluate underlying geology to help inform the onward development of the Eastern Green Link 2 (EGL2) Project. The support vessels will be providing crew change and pushing services to the jack up barge.

Boulder and Debris Relocation:

(Marine Licence: DCO/2016/00001)

Mariners are advised boulder and debris relocation operations will be undertaken along the eastern export cable route, western export cable route and interlink cable route by the vessel ‘Daniel Bernouilli’. Works have commenced and are estimated to be completed by mid-July 2025. Orsted requests all fishing gear is removed from the area of works shown in Figure 1.

Out of Service Cable Removal:

(Marine Licence: DCO/2016/00001)

Mariners are advised out of service (OOS) cable removal operations will be undertaken within the Hornsea Three array area. The works will be performed by the vessel ‘Voe Vanguard’ on 12 OOS cables along the eastern export cable route, western export cable route and interlink cable route. The works will commence from 10th July 2025 and the works are estimated to be complete by mid-July 2025. Orsted requests all fishing gear is removed from the area of works shown in Figure 1

Cable Installation Pre-lay Operations:

(Marine Licence: DCO/2016/00001)

Mariners are advised Trailing Suction Hopper Dredger (TSHD) works are planned along the Hornsea Three export cable route and interlink cable route. The vessels ‘Vitus Bering’ and ‘Pedro Alvares Cabral’ are currently on site and the works are estimated to be complete by the 31st August 2025. Orsted requests all fishing gear is removed from the area of works shown in Figure 1.

Wave Buoy recovery:

Mariners are advised that Hornsea Three will be commencing the recovery of the Fugro Oceanor Seawatch Midi wave buoy, deployed at the Hornsea Three export cable landfall location. In the same trip the vessel will also recover the Hornsea One and Hornsea Two wave buoys, all locations for recovery are show in Figure 2. The works will be conducted by the vessel “Boemmelbas” and expected to take 3 days from 15th to 25th July, depending on weather and vessel availability.

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. 

• THV Galatea will relocate the EA3 Special 4 Buoy and EA3 West 2 Buoy marking the boundary of the East Anglia THREE Offshore Windfarm Array.
• THV Galatea 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 038/2025: Aids to Navigation – Demarcation Buoy Relocation and Maintenance.

See detailed map on our bulletin website

See detailed map on our bulletin website

See detailed map on our bulletin website

See detailed map on our bulletin website

See detailed map on our bulletin website

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.

NtM 008-2025 - Precision 1 MBES Survey

The vessel will be conducting Subsea survey using a hull mounted Multi-Beam Echo Sounder MBES (please note; no equipment will be towed behind the vessel). Please give a 500m clearance to the vessel and all fixed structure locations whilst she is working in this area.

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.

The works, managed by Prysmian, will be carried out by Sub-contractor HDI.

The survey works in Scottish waters will start on approximately the 7 th July 2025 and are expected to be completed by the 20th July 2025 (weather dependent).

Vessels are requested to pass at a safe speed and distance and fishing vessels are advised to remain a safe distance, approximately 500m from the vessels identified.

Survey works will be ongoing and during the works the vessels will have restricted maneuverability as they complete their work scopes, which includes drop down equipment.

The vessels will not be towing equipment. The vessels will be the Jack-Up Barge 'Shearwater', Tug 'Feije' (or equivalent), High Speed Craft 'Venture' (or equivalent) and 'Jaguar' (or equivalent)

The Communication between the vessels will be through CH67 & 72.

VHF CH 16 will be monitored at all times and will be used to contact the coastguard in the event of an emergency.

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.

A marine vessel traffic survey is due to be undertaken for the proposed Ayre Offshore Windfarm project. The survey will be undertaken from one survey vessel, KARELLE, and will involve the collection of data of detected vessels and marine users through use of onboard radar, AIS and visual survey methods. The survey will collect data within a proposed vessel roaming area within the project array area. The extent of the area in which the survey vessel may be located during the survey is shown in Figure 1 in this NtM with accompanying coordinates in Table 1. The survey vessel will roam and/or remain nominally static within the area for approximately 14 days depending on weather conditions. The survey may be extended beyond 14 days depending on weather conditions, at which point further notification will be provided. Dates may be subject to change. The survey vessel will operate on a 24hr basis and display appropriate navigational lights at all times during operations.

A marine vessel traffic survey is due to be undertaken for the proposed Bowdun Offshore Windfarm project. The survey will be undertaken from one survey vessel, KARELLE, and will involve the collection of data of detected vessels and marine users through use of onboard radar, AIS and visual survey methods.

The survey will collect data within a proposed vessel roaming area within the project array area. The extent of the area in which the survey vessel may be located during the survey is shown in Figure 1 in this NtM with accompanying coordinates in Table 1.

The survey vessel will roam and/or remain nominally static within the area for approximately 14 days depending on weather conditions. The survey may be extended beyond 14 days depending on weather conditions, at which point further notification will be provided. Dates may be subject to change. The survey vessel will operate on a 24hr basis and display appropriate navigational lights at all times during operations.

See detailed map on our bulletin website

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. 

Vessels are requested to pass at a safe speed and distance and fishing vessels are advised to remain a safe distance, approximately 500m from the vessels identified. Survey works will be ongoing and during the works the vessels will have restricted maneuverability as they complete their work scopes, which includes drop down equipment. The vessels will not be towing equipment. The Communication between the vessels will be through CH67 & 72. VHF CH 16 will be monitored at all times and will be used to contact the coastguard in the event of an emergency.

See detailed map on our bulletin website

The cable installation will take place with the Blue Sky and will be assisted with support boats, regularly passing inside the working corridor for crew transfers and supporting nearshore cable landing operations.

Split pipe protection will be installed by divers.

Removal of fishing gear from the Installation Corridor (Figure 1) is requested during the period 21st July-8th August. Contact details for the FLO and FIR are provided at the end of this NtM.

Ahead of subsea cable installation operations, shore end teams will utilise ‘Flo West’ (or similar craft) for transiting between Coll and Tiree landfalls during operations.

Pre-installation activities will involve Pre-Lay Grapnel Runs (PLGR) to clear any debris, carried out across the cable installation route.

The cable installation will take place with the Blue Sky and will be assisted with support boats, regularly passing inside the working corridor for crew transfers and supporting nearshore cable landing operations.

Split pipe protection will be installed by divers, followed by rock bag installation. Removal of fishing gear from the Installation Corridor (Figure 1) is requested during the period 9th July to 23rd August. Contact details for the FLO ad DIR are provided at the end of this Notice to Mariners (NtM).

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

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

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.

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

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.

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.

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 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.

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.

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 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.

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.

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. 

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.

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. 

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 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.    

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.

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.

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.

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

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. 

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