News

Export cable joint burial at KP28 & 56 is postponed until further notice.On behalf of Inch Cape Offshore Ltd, Enshore will commence burial of export cable sections 1,2 & 3 from Cockenzie, East Lothian to the Inch Cape offshore substation.The trenching vessel, CMOS Installer shall utilise a jetting burial tool and a remotely operated vehicle (ROV) to bury the cable. CMOS Installer is expected to arrive at the export cable corridor on or around the 12th of December to commence trials followed by burial operations which are expected to continue until February 2026.

Note: There is a possibility (to utilise small weather windows) that an additional 5 (five) x Metocean Buoys will be installed within the Sofia Offshore Wind Farm Array. The coordinates for the buoys are below.

Vessels shall be monitoring channel VHF 16 and shall be displaying the relevant day shapes / night lights when restricted in its ability to manoeuvre.

Mariners are requested to refrain from entering and transiting through the construction area as demarcated by these demarcation buoys. 

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.

The table below provides a summary of additional Met-Ocean Buoys to be deployed at the SOWF Array.

The Inch Cape site demarcation buoyage noted below has been repaired and is operating normally.

·       North Cardinal demarcation buoy lantern replaced

·       South Cardinal 1 demarcation buoy replaced

·       South Cardinal 2 demarcation buoy replaced

·       Special Mark 6 demarcation buoy replaced 

On behalf of Inch Cape, OEG Ltd. will carry out maintenance on the remaining 7 demarcation buoys which will include the replacement of the marine lanterns on each buoy.

Locations of the 7 buoys including coordinates are shown below in section 3.

The multi cat vessel MV Cameron is expected to arrive at Inch Cape on the week commencing 8th Dec to commence the maintenance, operations are expected to be complete in 2 days dpending on weather. 

The exposures are present intermittently across all four cable routes in the area bounded by:

51° 5.23’N 001° 17.20’E 51° 3.33’N 001° 17.20’E 51° 5.00’N 001° 11.67’E 51° 4.88’N 001° 11.67’E

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

A remedey plan is currently being worked on to support reinstatement of the unlit buoy. 

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:

• Bos Pool;
• Bos Base;
• Dina Merkur;
• Dina Supporter;
• Dina Supplier;
• Dina Scout;
• Highland Knight - Circa December 2025 (TBC)

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 'SOVs' ACTA Centaurus and Austri Enabler continues operations within the Sofia Array.

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 continue operations at the Sofia OWF. 

All Mariners are advised to always give a wide berth of approx. 500m metres from the above vessels. The vessels shall be exhibiting the correct day signals / night lights for the operations as defined by COLREGS and 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 SOV 'ACTA Centaurus' and 'Austri Enable continues operations within the Sofia Array.

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.

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.

Inter Array Cable Installation

The Cable Lay Vessel (CLV) Viking Neptun has completed the first round of inter array cable installation works. The Cable Burial Vessel Assister will conduct trenching operations on surface laid Inter Array Cables (IAC). The Service Operations Vessel, Norside Cetus will continue with IAC termination and testing works.

During operations, the Assister 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.

Construction Support Activities

The Offshore Construction Support Vessels Grampian Tees, Grampian Tweed and Grampian Eagle will continue with ongoing construction support activities within Dogger Bank B construction site. 

The Fall Pipe Vessel (FPV) Rollingstone will resume subsea rock installation at various locations within the Dogger Bank B construction area.

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, 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.

Seabed survey in preperation for the Jack up campaign in January/February

6 assets (IGH05, X 18, IGF01, IGL01, GAD03, GAD04)

The jack-up vessel ‘JB 120’ will be positioned alongside the East Anglia THREE Offshore Converter Station (OFCS) within the East Anglia THREE Offshore Windfarm area. The activity will consist of the following three phases:

1.  Jacking-Up Procedure: The JB 120 will be temporarily soft jacked on a safe stand-off position, whilst four temporary anchors and mooring lines are deployed by the anchor handling vessel. The deployed mooring lines will be used to move the JB 120 safely towards its final position, where it will be fully jacked.

2.  Operational Phase: Once jacked up, the JB 120 will remain stationary for an estimated six months.

During operations, the ‘JB 120’, Anchor handling tug, Assistant tug and Lead tug will be restricted in their manoeuvrability as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. All vessels will transmit an Automatic Identification System (AIS) message.

A 500m statutory safety zone will then be maintained around the ‘JB 120’ at all times.

See detailed map on our bulletin website

Partrac Ltd., on behalf of Jan De Nul and Southern Electricity Networks (SSEN), is deploying a metocean seabed frame mooring at three landfall sites for an interconnector cable project between NW Skye and South Uist. The seabed frame sites are located in Holmar Bay (Uist), Ardmore Bay (Skye) and Meanish Pier in Loch Pooltiel (Skye), and each frame will be deployed for 30 days. Partrac is planning to carry out the frame deployments from 10/12/2025 over two days, weather permitting, using the vessel C-Force.  During deploymentactivities, the vessel will be restricted in their ability to manoeuvre and will display the appropriate lights and shapes prescribed by the International Regulations for Preventing Collisions at Sea. Other vessels are requested to provide a minimum clearance of 50m from the installation vessel during operations, and post-installation, and to pass at a safe speed.

More details in the attached notice to mariners.

The survey will acquire seabed sediment samples using a Hamon grab and will be completed by personnel from Ocean Ecology from the vessel Seren Las.

The jack-up vessel ‘JB 120’ will be positioned alongside the East Anglia THREE Offshore Converter Station (OFCS) within the East Anglia THREE Offshore Windfarm area. The activity will consist of the following three phases:

1.   Rig move: The JB120 will be towed and maneuvered to its designated location by use of tug vessel.

2.  Jacking-Up Procedure: The JB120 will be temporarily soft jacked on a safe stand-off position, whilst four temporary anchors and mooring lines are deployed by the anchor handling vessel. The deployed mooring lines will be used to move the JB120 safely towards its final position, where it will be fully jacked.

3. Operational Phase: Once jacked up, the JB120 will remain stationary for an estimated six months.

During operations, the ‘JB 120’, Anchor handling tug, Assistant tug and Lead tug will be restricted in their manoeuvrability as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. All vessels will transmit an Automatic Identification System (AIS) message.

1.  Geophysical surveys around WTG J08 at Moray East Wind Farm – REV 1 change of vessel

Please be advised that Moray Offshore Windfarm (East) Limited (Moray East) are planning to undertake a geophysical survey around WTG J08. Survey operations will be carried out by the Unmanned Surface Vessel: X-17 (vessel specs in Table 2), which is expected to arrive at site on 06/12/2025, subject to weather.

The geophysical survey scope is a Multibeam Echosounder (MBES) survey, completing a 270m x 270m box around WTG J08 (location below in Table 1).

Table 1: Location of J08

1.       General Safety Advice

Please be aware that, during the survey activities, by virtue of its mode of operation the vessel X-17(Unmanned Surface Vessel) 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) 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)

2.       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.

Full multi-beam bathymetry survey of the 4 London Array export cables. The survey will commence out of Ramsgate with the vessel making its way around the headland for access to the export cables. The survey should take 10 days, exclusive of weather. The data will be acquired onboard the Spectrum 2, a 21m catamaran. Currently there is no towed equipment on the vessel (updates will be made to the notice if it is required). 

See detailed map on our bulletin website

The jack-up vessel ‘JB 120’ will be positioned next to the East Anglia THREE OFCS within the East Anglia THREE Offshore Windfarm area.

• Rig move: The vessel will be maneuvered to its designated location.
• Jacking-Up Procedure: The vessel will be temporarily soft jacked on a safe stand-off position, from where its four anchors and mooring lines will be deployed. The deployed mooring lines will be used to move the vessel safely towards the final position, where the vessel will be jacked.
• Operational Phase: Once jacked up, the vessel will remain stationary for an estimated six months.

During operations, the ‘JB 120’, ‘CENTAURUS’ (Lead tug), ‘FAIRPLAY 62’ (Assistant tug) and ‘FAIRPLAY 32’ (Assistant tug) 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.

A Statutory Safety zone of 500m radius will be in place around the ‘JB 120’ at all times.

‘JB 120’ and supporting tugs are supplied with VHF multi-channel radios and mobile phones.

Please be advised that on behalf of WSP UK Ltd, Fugro is planning to conduct a geophysical and seismic survey on the River Tyne. WSP requires seabed and sub-sea floor data ahead of a future project to replace an existing overhead power line with an underground tunnel.

The non-intrusive survey works shall be split into 2 passes, the first using 2D seismic towed equipment to provide sub-sea floor data. The second pass using Multibeam echo sounder (hull mounted), sub bottom profiler (vessel mounted) and side scan sonar (towed) to provide geophysical data. 

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 the first recovery attempt in January 2025 so is thought to have broken free from the clump weight. The frame was designed to be overtrawlable however the clump weight was not so could potentially pose a snag hazard. 

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

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. 

The campaign will commence on the 27th of September 2025 and continue until approximately 20th of October 2025. The works will be continuous, 24 hours a day. Charts of the DBC array area are provided below.

The operations include the post lay burial operations for part of the array cable routes, by means of jetting in order to protect the inter-array cables.

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

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

See detailed map on our bulletin website

The works will be performed in a single campaign, commencing on the 7th of December 2025 and continuing until approximately Q4 2026. The works will be continuous, 24 hours a day. The operations will include visual inspections and remedial maintenance at the Offshore Substation Platform (OSP) and at installed WTG foundation locations. During operations, the IWS Sun Walker 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 SOV and pass at reduced speed. Fishing gear or other equipment with seabed intervention should not be deployed when approaching the working area.

THV Patricia has relocated the EA3 East 1 Buoy, EA3 East 2 Buoy, EA3 East Buoy 3 and the EA3 Special 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 080- 2025 - Aids To Navigation – Demarcation Buoys.

EGL2 are due to commence an unexploded ordnance (UXO) target investigation ROV survey. The works are to be conducted within the Exclusion Blocks and updated coordinates are available on request.

The works consist of an ROV carrying out visual target investigation for the purposes of identifying potential unexploded ordnance. There will also be a small amount of debris recovery required depending on what is found during the investigations.

Works are being undertaken under an approved Marine Licence from the Marine Directorate (MS-00011033) and the approved Marine Licence from the Marine Management Organisation (L/2023/00211/2)

There will be no unexploded ordnance detonations performed; this is investigation works only.

EGL2 are due to commence an unexploded ordnance (UXO) target investigation ROV survey on the 14th of September 2025.

The works are to be conducted within the Exclusion Blocks shown by Figure 1, and updated coordinates are detailed in Table 1, both given below.

The works consist of an ROV carrying out visual target investigation for the purposes of identifying potential unexploded ordnance, small excavations on the seabed may also be undertaken to identify targets. There will also be a small amount of debris recovery required depending on what is found during the investigations.

The work is estimated to finish on approximately the 30th of December 2025, subject to weather.

Works are being undertaken under an approved Marine Licence from the Marine Directorate (MS-00011033) and the approved Marine Licence from the Marine Management Organisation (L/2023/00211/2)

There will be no unexploded ordnance detonations performed; this is investigation works only.

EGL2 are due to commence an unexploded ordnance (UXO) target investigation ROV survey on the 22nd of August 2025.

The works are to be conducted within the Blocks shown by Figure 1, and updated coordinates are detailed in Table 1, both given below.

The works consist of an ROV carrying out visual target investigation for the purposes of identifying potential unexploded ordnance, small excavations on the seabed may also be undertaken to identify targets. There will also be a small amount of debris recovery required depending on what is found during the investigations.

The work is estimated to finish on approximately the 30th of December 2025, subject to weather.

Works are being undertaken under an approved Marine Licence from the Marine Directorate (MS-00011033) and the approved Marine Licence from the Marine Management Organisation (L/2023/00211/2)

There will be no unexploded ordnance detonations performed; this is investigation works only.

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 in the chart below. Coordinates of the survey area are also included.

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.

Scottish Hydro Electric Transmission Plc and National Grid Electricity Transmission Plc are delivering the Eastern Green Link 2 (EGL 2) Project.

The EGL 2 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 survey works for EGL 2 precedes the installation of an electricity transmission link from the East coast of Scotland (Sandford Bay, Peterhead) to the East coast of England (South of Bridlington/Flamborough Head) due to be completed in 2029.

A detailed geophysical inspection survey at 14 areas along the route will be undertaken from the MV Scotia.

The survey will be conducted using a Remotely operated vehicle (ROV) with cable detection and Multibeam echosounder systems. Marine Mammal observations will be undertaken during the operations.

The operations are planned to be carried out from the 5th of December 2025 and could extend until the 20th December 2025.

The following considerations should be made regarding operational activities:

• A safe distance of 0.5 nautical miles from the vessel must always be maintained.
• It is also requested to establish contact with the Scotia (VHF 16) to obtain information on the planning and to allow a coactivity on the zone without obstructions.
• It is requested that the work area be kept clear of fishing gear to avoid entanglement.
• The Scotia may have an ROV (remotely operated vehicle) deployed Subsea beneath the vessel and be restricted in manoeuvrability.
• The vessel will display all applicable lights and shapes.

The vessel Normad Vision, call sign LAQR7, will enguage in subsea works at the Meygen tidal array, located in the Inner sound of the Pentlnd Firh.

The vessle will be undertking subsea works in the slack tide durations supproted by WCROV.

The works will also incldue cable handlnig with the vessel secured to the asset between slack tides. 

It is currently anticipated that weather permitting, works will commence circa the 28/11/2025. The weather buoys will remain on station throughout the construction phase of the East Anglia THREE Offshore Windfarm.

Completion of maintenance works will be notified by future Notice to mariners.

Mariners are advised about Marine Survey Works for the Eastern Green Link 2 Project. Scottish Hydro Electric Transmission Plc and National Grid Electricity Transmission Plc are delivering the Eastern Green Link 2 (EGL 2) Project. The EGL 2 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 survey works for EGL 2 precedes the installation of an electricity transmission link from the East coast of Scotland (Sandford Bay, Peterhead) to the East coast of England (South of Bridlington/ Flamborough Head) due to be completed in 2029.

The following equipment will be recovered, maintained, and redeployed on the site for the duration of the project:

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

Latest information as per NTM-014-2025 2 x generator exchanges on IGD07 and GAD10 

The Jack up WIS (windserver)  will come to complete the above around 6th December then leave site

It is then expected to return around the 12th Jan for a larger campaign currently with an additional 5 assets - TBC 

I am unable to uplaod the NTM however this has been distributed 

Mariners are advised that from 01/12/25 to 31/01/26, Fugro jack-up barge (JUB) “WaveWalker 1” will be performing nearshore geotechnical borehole investigations. This will be conducted on behalf of the client Scottish & Southern Electricity Networks Transmission (SSENT).“WaveWalker 1” will be towed between sites and supported throughout by anchor handling tug/utility vessel “Elisa”. Work sites for “WaveWalker 1” are at Rattray Head (north of Peterhead) and Sinclair’s Bay (Caithness). A decision on which site will be sequenced first is to be made during tow following mobilisation in Great Yarmouth.At each site three (3) number boreholes will be drilled in order to assess geological conditions. Approximate borehole locations are between 400m and 1,200m from shore.A 500m exclusion zone will be enforced around the JUB at all times. Vessels are to take caution when navigating in this area and pass well clear of the JUB. Earliest start (either site) is 1st December 2025. Precise date dependent on progress of tow from mobilisation in Great Yarmouth which is weather sensitive. This notice may be updated when the worksite sequence is known and / or arrival date better defined.Following completion of operations at first site, the JUB will be towed to the second.

Details:

· The SWR section is assumed to be a remnant of discarded trawl wire or anchor cable.

· The wire does not pose a hazard to general navigation.

· However, it may present a risk to small vessels when anchoring or operating gear near the seabed in close proximity to the locations detailed in the table below.

· There was an extensive length/volume of SWR recovered during UXO TI investigations. The Glomar Wave was not able to safely bring this on deck, so it was placed atop the SWR that it was connected to.

· SWR was placed here for wet store until further notice.

The metocean ADCP seabed frame deployment for WL2 is due to commence on 08/09/2025, subject to weather. The ADCPs are expected to be recovered by 15/12/2025, subject to weather. The ADCP seabed frames are weighted objects with imbedded sensors, which sit passively on the seafloor to collect environmental data, including current profiles, turbidity, and temperature measurements at the sites of deployment. One ADCP will be deployed approximately 3.4 km northwest of Girvan. The other ADCP will be deployed approximately 3.5 km west of Troon. The ADCPs will be deployed and serviced by the support vessel, 'CT Barnston.' The vessel will mobilise at the Port of Troon.

The metocean ADCP seabed frame deployment for WL2 is due to commence on 05/09/2025, subject to weather. The ADCP seabed frame is expected to be recovered by 15/12/2025, subject to weather. The ADCP seabed frame is a weighted object with imbedded sensors, which sit passively on the sea floor to collect environmental data, including current profiles, turbidity, and temperature measurements at the site of deployment. The ADCP will be deployed and serviced by the support vessel, 'CT Barnston.' The Vessel will mobilise at the Port of Holyhead. 

The Western Link 2 subsea cable project is being developed by Scottish Power Energy Networks Plc and National Grid Electricity Transmission Plc.

The metocean ADCP seabed frame deployment for WL2 is due to commence on 05/09/2025, subject to weather. The ADCP seabed frame is expected to be recovered by 15/12/2025, subject to weather. The ADCP seabed frame is a weighted object with imbedded sensors, which sit passively on the sea floor to collect environmental data, including current profiles, turbidity, and temperature measurements at the site of deployment. The ADCP will be deployed and serviced by the support vessel, 'CT Barnston.' The Vessel will mobilise at the Port of Holyhead. 

The Western Link 2 subsea cable project is being developed by Scottish Power Energy Networks Plc and National Grid Electricity Transmission Plc.

Galloper Windfarm Bathymetric Survey on four locations / array cables between OSP and 4 x WTG locations by Survey Vessel Northern Storm commencing 6th November 

Mariners are advised that a geophysical survey is planned for the Eastern Green Link 5 (EGL 5) project. The marine survey activities for EGL 5 are planned to commence on the 23rd of November 2025 and are expected to complete approximately mid-January 2025. SSEN Transmission and National Grid Electricity Transmission (NGET) are working together to address the need for increased capacity within the transmission network between Scotland and England. EGL5 will help provide increased capacity, carrying up to 2 GW of electricity, enough for two million homes. This will be achieved through a High Voltage Direct Current (HVDC) cable connection between Aberdeenshire and Lincolnshire.The EGL 5 geophysical survey works are being carried out by Ocean Infinity Limited.The area of work, pertaining to this Notice to Mariners (NtM) for EGL 5, is highlighted in Figure 1, with the survey vessels contact details for the project found in Table 1. Contact details for the project Fisheries Liaison Officers (FLO) are detailed below.

The Marine Characterisation Research Project (MCRP) is an innovative research and development project that will ensure the safe phased deployment of tidal
energy turbines in the Morlais Demonstration Zone (MDZ). Working with a team of experts, the project are developing an Environmental Monitoring and Mitigation Plan to safeguard marine wildlife. The findings will subsequently be available for future marine renewable energy projects to enable the growth of tidal stream energy.

The aim of the project is to facilitate environmental data collection, and support research and development of turbine centred monitoring and mitigation devices. The knowledge gained will enable the safeguarding of wildlife during the development of the MDZ.

To best exploit the opportunity available to gather valuable and relevant information, the MCRP procured a scientific lidar research buoy, upon which the MCRP have deployed data collection equipment, in order to gather baseline data from the MDZ and test the equipment.

Following a successful refit in the port of Holyhead during November 2024, the Marius buoy had been redeployed in the Morlais zone for a further 12-month period of data collection.

Following this the decision has been made to extend the deployment for a further 6 month period to support refinement of the technologies, and enable in situ demonstration.

On behalf of Inch Cape Offshore Ltd, N-Sea will continue seabed preparation activities within the wind farm site boundary and its export cable corridor. Initially boulder clearance will focus on the wind farm site with clearance in the export cable 2 route commencing in the new year on a date to be confirmed. 

Seabed preparation includes the relocation of any boulders which may affect the installation of offshore structures, inter-array cables and export cables.

The boulder relocation vessel, FS Aries will be joined by N-Sea Pathfinder on or around Wednesday the 27th of November.

Please be aware that, during the major repair activities, by virtue of its mode of operation the Jack-up vessel 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 Deme Apollo and their crew, and the ability to undertake its contracted works, fishermen who have static fishing gears deployed within 500 m from the WTG where major repairs are planned 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

The Scottish Ministers have authorised the establishment of a 500-metre radius safety zone around all major maintenance works being undertaken. The safety zones will be active when the jack-up vessel involved in undertaking major maintenance works is attached to, or anchored next to, the renewable energy installation. No more than one 500 metre major maintenance safety zone will be active at any given time.All mariners are requested to give a wide berth to all vessels involved in the major repair activities.Mariners are requested to navigate with caution, to use all means appropriate to aid safe navigation as defined under COLREGs Rule 7, and keep continued watch on VHF Ch. 16, 87 and 73 when navigating the area.

The CSOV ‘WINDEA Clausius’ provides accommodation and Walk-to-Work access for the commissioning phase of the East Anglia THREE Offshore Converter station (OFCS) ‘EA3 OFCS’. ‘WINDEA Clausius’ will be deployed inside East Anglia THREE Windfarm and is equipped with VHF multi-channel radios and mobile phones.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 East Anglia THREE, these areas shall as far as practicable be avoided during transits from 01st November to 31st March.

SLB 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.

It is currently anticipated that, weather permitting, works will be conducted on a continuous basis (i.e., 24-hour working, seven days a week).

For further information regarding export cable installation operations, please see attached East Anglia THREE Notice To Mariners: EA3 NTM 53/2025- Export Cable Installation.

GEOxyz will utilise the ‘Geo Ocean IV' to perform a Pre-Installation Survey within the East Anglia THREE Offshore Windfarm.The vessel will conduct Multibeam Echo Sounder (MBES) and Side Scan Sonar (SSS) surveys of the Wind Turbine Generator foundation locations, at a radius of 170m.

The Multibeam Echo Sounder is hull mounted and the Side Scan Sonar is towed from the stern of the vessel at a height of 6.5m to 10m above the seabed.

GeoOcean IV will monitor VHF Channel 16 and VHF DSC Channel 70 continuously throughout the operation. It is currently anticipated that weather permitting, works will be carried out on a continuous basis (i.e.,24- hour working, seven days a week) unless notified otherwise.

For further information regarding Pre Installation Survey Campaign 3, please see attached East Anglia THREE Notice To Mariners: EA3 NTM 077/2025 Pre-Installation Survey Campaign 3.

All mariners and stakeholders are advised that during Passive Acoustic Monitoring (PAM) array servicing, three objects were dropped overboard from the vessel, it’s unclear whether these items will be recoverable, these items are close inshore in the vicinity of Montrose Bay and Broughty Ferry.

Object 1 is a 25cm hydrophone, Object 2 consists of 4 x 20kg weights, acoustic release equipment and 50m of 4mm dyneema rope, Object 3 is an acoustic release canister, 4 x 20kg weights and 36m of 4mm dyneema rope. This rope may constitute a hazard to small craft.

The servicing campaign shall resume as weather conditions allow.

Table 1 -Dropped Object coordinates.

Confirmed Unexploded Ordnance within the East Anglia Three CDM boundaries of the offshore windfarm array and export cable route.

The ERRV ‘ESVAGT CARPATHIA’ provides relief duties for standby emergency rescue services during thecommissioning phase of the East Anglia THREE Offshore Converter station (OFCS) ‘EA3 OFCS’. The ESVAGT CARPATHIA will be required to cover these duties when the primary Emergency Response Rescue Vessel 'ESVAGT CARTPATHIA' conducts port calls for crew changes and resupplies.

It is currently anticipated that weather permitting, operations will be carried out on an on-demand basis (i.e.weekly, bi-weekly, ad hoc).Arrival and departure plan of the 'ESVAGT CARTPATHIA' will be notified via the East Anglia THREE Weekly Noticeof Operations.Completion of the 'ESVAGT CARTPATHIA’s' work scope will be notified by closure of this Notice to Mariners.All vessels will continuously monitor VHF Channel 16 and VHF DSC Channel 70 throughout operations.It is currently anticipated that weather permitting, works will be carried out on a continuous 24-hour basis,seven days a week, unless notified otherwise.

Please be advised that the Q&E North Cable System has become exposed at the following locations:

51° 22.5823’ N  2° 0.5343 E

51° 22.5948’ N  2° 0.7922 E

51° 22.5963’ N  2° 0.8562 E

All seabed users are politely requested to avoid this area due to the risk of snagging any equipment engaging with the seabed.

The marine survey activities for WL2 have commenced on 28/09/2025, subject to weather. The survey is due to be completed by 15/12/2025, subject to weather.

The offshore work is to be conducted within the area exhibited in Figures 1-5, and updated coordinates are detailed in Tables 1, 2, and 3. The marine works consist of geophysical and crossings surveys. The geophysical surveys will be conducted by the vessels Fugro Galaxy and Fugro Kommandor Iona, and will consist of both hull mounted and towed systems. The crossings surveys will be conducted by the vessel Fugro Scotia. There is no intrusive work planned.

Inch Cape Offshore Ltd Generating Station (GS) construction activities will commence within the Inch Cape Offshore Wind Farm on or around the 15th of December 2025. The GS construction activities include installation of Wind Turbine Generator (WTG) Foundations, Inter Array Cables (IAC) and WTGs. 

These GS construction activities follow on from the Offshore Transmission Infrastructure (OfTI) - export cables, and offshore substation platform construction activities - which commenced earlier in the year (commencement of OfTI works notified by ICOL in NTM reference 2/2025).

The GS construction activities will commence initially with WTG Foundation monopiles installation at the array site, managed on ICOL’s behalf by Jan De Nul and IQIP. Other GS construction activities to follow. 

Further Notices to Mariners detailing individual GS work scopes will be promulgated prior to works starting. 

These GS construction activities will also be added to Weekly Notices of Operations including a project vessel report. These Weekly Notices will be promulgated to stakeholders and posted on the Inch Cape website, please visit www.inchcapewind.com 

Offshore construction activities are expected to be completed by late 2027.

NKT will conduct Post-Lay Mattress Installation along the East Anglia 3 export cable corridor in the North Sea using the vessel Olympic Taurus. The work will be performed in a single campaign with up to 3 planned loads. Post-lay protection, consisting of concrete mattresses and rock filter units, will be placed on the export cable at third party asset crossings and remedial locations. In/out surveys will be performed prior to and following placement.

It is requested that all vessels maintain a minimum of 1.5Nm separation distance from Olympic Taurus and pass at reduced speed.

 Fishing gear or other equipment with seabed intervention should not be deployed when approaching the working corridor.

Rock Filter Units (RFUs) will be over boarded from the Grand Canyon III and will wet store circa 400 x 8Te RFU’sacross the East Anglia THREE Offshore Windfarm area set out in section 2.1

Program Schedule:

Grand Canyon III is expected to mobilize from the port of Blyth circa 14/11/2025 and expected to commenceloading operations from the Port of Great Yarmouth Circa 15/11/2025. Completion of Works will be notified by thecancellation of this Notice to Mariners.

Grand Canyon III will monitor VHF Channel 16 and VHF DSC Channel 70 continuously throughout the operations.It is currently anticipated that weather permitting, works will be conducted on a continuous basis (i.e.,24- hourworking, seven days a week) unless notified otherwise.

SSEN Transmission and National Grid Electricity Transmission (NGET) are working together to address the need for increased capacity within the transmission network between Scotland and England. EGL5 will help provide increased capacity, carrying up to 2 GW of electricity, enough for two million homes. This will be achieved through a High Voltage Direct Current (HVDC) cable connection between Aberdeenshire and Lincolnshire.

The EGL 5 geotechnical survey works are being carried out by Ocean Infinity Limited.

The area of work, pertaining to this Notice to Mariners (NtM) for EGL 5, is highlighted in Figure 1, with the survey vessels contact details for the project found in Table 1. Contact details for the project Fisheries Liaison Officers are detailed below.

Please note, this survey will be able to operate around static fishing gear. Therefore, fishing gear clearance is not being requested.

Navigational Safety Advice

Vessels are requested to pass at a safe speed and distance and fishing vessels are advised to remain a safe distance, approximately 550m (0.3 nautical miles) from the areas identified. During these works the vessel will have restricted manoeuvrability as it completes its work scope.

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

Survey Vessels

The geotechnical survey works are being carried out by Ocean Infinity Limited using the following vessels:

Survey vessel: A7803 (IMO 9924261; MMSI 563175900; Call Sign 9V8529)

The westerly exposure is 26m long, the easterly is 27m long.

Mariners are advised that a UXO marine geophysical survey is planned for the Eastern Green Link 3 (EGL 3) project. The marine survey activities for EGL 3 are planned to commence on the 29 September 2025 and are expected to complete around the end of December 2025.

EGL3 is a HVDC electricity transmission interconnector between Scotland and England, a joint venture between National Grid and Scottish & Southern Electricity Networks ((SEN) Transmission.

The EGL 3 project will play a vital role in achieving the UK and Scottish governments net zero targets and significantly increase the UK’s capacity for clean, green renewable power.

The EGL 3 UXO marine survey works are being carried out by Spectrum Geosurvey Limited.

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

Scheduled potential UXO investigation works are due to commence along EA2 Export cable corridor and offshore wind farm CDM area. These works will be carried out using the Glomar Worker, Ross Eagle and Tor Boreas vessels. The Glomar Worker and Ross eagle will be mobilised with WROVs to investigate targets and Tor Boreas will be a dive support vessel identifying targets closer to shore.  Investigation operations will be carried out between September 2025 and December 2025. 

Scheduled vessel dates are as follows...

Glomar worker mobilise on 14/09 - completing Dec 25

Ross Eagle mobilising on 17/09 - completing Dec 25

Tor Boreas dive support vessel mobilising on 20/09 - completing Dec 25

The Glomar Worker and Ross Eagle will identify targets in the OWF & ECR and Tor Boreas will identify targets nearer to shore. 

Rollingstone will start operations on 14th of November 2025 and will perform rock placement during multiple load-outs, finishing her scope around 31st of December 2025. Work will be continuous, 24 hours a day. Coordinates of the DBA, DBB and DBC are presented in Tables below.

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

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

One (1) USV will be mobilised from Fleetwood, where the USV will transit to the areas of operation. During the operations, the USV will be performing a Hydrographic Survey of the areas specified in the figure below, within the 12nm limit.Support vessels will escort the USV from the harbour entrance and will then continue transiting towards the survey site until the area is safe & clear of hazards. Once the survey is complete, the USV will return to Port, again with a support vessel as an escort.It is requested that other vessels remain clear, so far as is practicable, during transit & survey operations.Although the vessel is uncrewed, it is managed throughout the 24-hour operation, piloted remotely using 360 degree cameras and other navigational aids.

During recovery operations following completion of metocean data collection at the Muir Mhor site, the seabed frame was unable to be recovered. Seabed frame recovery was not possible due to transponder onboard vessel being unable to make a connection with acoustic receiver on the seabed frame. It is not yet confirmed whether the seabed frame is in the deployed location and is simply damaged, or whether it has been moved. 

See attached photo for details of the frame.

Last known location of the seabed frame is the deployed location as per coordinates given in this notice.

Report has been made to Marine Directorate on 22/07/2025. Further updates on recovery will be posted to this notice.

Search and recovery scheduled for November 2025.

See detailed map on our bulletin website

Sofia OWF are currently evaluating the exposure risks and will update accordingly. 

At this this time, it is important to note that the cable is sensitive to any external impact and constitutes a SUBSEA SNAGGING RISK for anchoring, fishing gear or other equipment with seabed intervention. Seabed activities should be avoided within the designated area until further notice. 

The Guard Vessel “Enterprise II” shall be monitoring VHF 16 during their scope of the works.

Scottish & Southern Electricity Networks (SSEN) wish to inform Mariners of the completion of marine works in the near-shore area off Warbeth, Orkney which forms part of the Orkney -Caithness HVAC Link  Project.  The completion of this work includes the installation of two subsea assets in the form of two ducts and associated rock bags approx 1km SW of Warbeth Beach, Orkney and have been placed with in the boundaries of the  4 points and associated coordinates  detailed in the attached NTM. The works have resulted in a reduction in charted water depth. 

 Mariners are advised to stay well clear of the area as detailed until further notice.

Crew Transfer Vessel NR Predator 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 East Anglia THREE, these areas shall as far as practicable be avoided during transits from 01st November to 31st March. 

The ERRV ‘ESVAGT COBRA’ provides standby emergency rescue services during the commissioning phase of the East Anglia THREE Offshore Converter station (OFCS) ‘EA3 OFCS’.  

 ‘ESVAGT COBRA’ will carry out regular transits between East Anglia THREE Windfarm and the port of Lowestoft and is equipped with VHF multi-channel radios and mobile phones.

NKT will conduct Subsea Rock Installation (SRI) operations along the East Anglia THREE export cable corridor using the vessel DPFPV Flintstone. Rock will be placed on the export cable at third party asset crossings and remedial locations. In/out surveys will be performed prior to and following rock placement.

All vessels are requested to maintain a 1.5 Nautical Mile safety distance from the Flintstone during operations and pass at a reduced speed.

Fishing gear and or other equipment with seabed intervention should not be deployed when approaching the working corridor.

During SRI operations, Flintstone will have restricted manoeuvrability as defined under COLREGs (International Regulations for Preventing Collisions at Sea, 1972). The vessel will display the appropriate day shapes and lights and will transmit an Automatic Identification System (AIS) message. To protect the cable in the working corridor, guard vessels have been deployed along the route (as detailed in East Anglia THREE Notice To Mariners 065-2025 ). The Guard Vessels will monitor and issue warnings to marine traffic operating within six nautical miles of the construction area, with a Closest Point Of Approach (CPA) of less than 1.5 Nautical Miles.

The platform supply vessel ‘BOS PRELUDE’ provides supply service during the commissioning phase of the East Anglia THREE Offshore Converter station (OFCS) ‘EA3 OFCS’.

‘BOS PRELUDE’ will deliver supplies to the ‘EA3 OFCS’ and the jack-up vessel ‘JB 120’ (as long as installed next to the OFCS) as well as carry out regular voyages between East Anglia THREE Windfarm and the ports of Emden (Germany, main service port) and Lowestoft (UK) and is equipped with VHF multi-channel radios and mobile phones.

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 East Anglia THREE, these areas shall as far as practicable be avoided during transits from 01st November to 31st March.

To Owners, Ships Agents, Masters, Pilots and Fishermen. Please see the following: 

Risk of cable exposure within the Rampion Wind Farm

Following the most recent subsea survey carried out in April 2025, updated information of inter-array cable exposures are listed and illustrated below.

Analysis of survey data at the wind farm indicates the locations of exposures of sections of inter-array cables are subject to change resulting from dynamic movements of the seabed but are primarily focused within the South-South East of the wind farm area.

Mariners are reminded that further safety information related to array cable exposures can be found in “The Risks of Fishing Near Cables and Renewable Energy Structures”, published on the KIS-ORCA website https://kis-orca.org/safety/the-risks-of-fishing-near-cables-renewable-energy-structures/. General safety information can be found here: https://www.seafish.org/article/kingfisher-bulletins.. All mariners are requested to make themselves aware of their obligations for conducting activities over buried and protected cables under International and UK Cable (Subsea) Protection Legislation. Distribution: 

As per Rampion Notices To Mariners Distribution List. Please feel free to share the information. 

Reported faults on AIS system, Fog Sounding Warning and Aviation lights.

Please review attached notice for further information on each item.

HS1 - Failed aviation lighting

HS1 & HS3 - No AIS Signal

HS2 & HS4 - Failed fog sounder

The survey involves up to 3 pilot drills, which will be drilled from the land side of the proposed export cable corridor (above MHWS) and the drills will pass under the seabed in the intertidal zone. The pilot drills will be between 750-800m in length, of which up to 450m-500m will be under the marine environment, and ranging between 7m-12m below seabed level. The pilot drills will be drilled under the intertidal zone and nearshore area, and will not punch out to the seabed, with all works occurring wholly under the seabed.

Some primary aims of the SubSea Soundscape project are;

To support a new Marine mammal evidence base for the Celtic Sea.

To create a region wide acoustic soundscape model and open-source baseline acoustic data of the Celtic Sea integrating new S3 data and other secured acoustic data sources.

To Co-develop road maps for the use of acoustic soundscape models for consenting

Navigation Advice

• Equipment is fully subsurface and presents no hazard to surface navigation.
• Trawling, dredging, or seabed gear deployment in the vicinity of marked positions could be avoided to reduce risk of entanglement or equipment damage.

Service of the 17 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.

For further information regarding PAM station servicing, please see attached East Anglia Three Notice To Mariners 064 - 2025.

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.

Last known location of the seabed frame is the deployed location as per coordinates given in this notice. Please ensure fishing gear is at a safe distance to avoid entanglement. Acitivities will commence in November 2025. Vessel mobilisation port TBC.

This Notice will be updated as further details are available.

Note: this notice is a replacemnt for Notice ID5300 which was originally submitted 26th August 2025.

Muir Mhòr Offshore Wind Farm Limited will deploy 2 x Measurement Systems to collect data located within a 1.5km x 2.5km area. Once deployed this Notice will be updated with as laid co-ordinates. The campaign is expected to last up to 2yrs.

The works will consist of the deployment of two seperate systems with buoys connected to a mooring line & chain anchored to the seabed with backup recovery line. Please ensure fishing gear is at a safe distance to avoid entanglement. Works will commence in October/November 2025 and the installation vessel will mobilise from Peterhead Port. 

Note: this notice is a replacemnt for Notice ID5254 which was originally submitted 18th August 2025.

Main Bearing MAjor Component Exchanges on 5 x WTGs

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. 

A de-energised array cable has detached from the mooring anchor and is floating on the water surface, in the following area:

57° 29,088' N 1° 22,338' W > 57° 29,834' N 1° 22,305' W > 58° 29,834' N 1° 22,495' W

All vessels are recommended to refrain from transiting through the windfarm whilst this hazard is in place.

VESSELS in attendance:

MCS Swath IMO: 9808962. MMSI 235117181. Call Sign: 2JMP4

GV Karelle - IMO:9128386. MMSI 234325000 Call Sign: MWXN5

Normand Sapphire - IMO:9372169. MMSI 257282000 Call Sign: LNXW

Update28.08.2025 Potential Hazard for mariners - Hywind Scotland Windfarm. Today (Thursday 28th August), one of the array cables has become detached at one end from the mooring anchor at Hywind Scotland, the cable is de-energised .

Update 29.08.2025 Commencing on 30th August 2025, subsea visual inspections are required to be carried out at Hywind Scotland Windfarm on all 5 x Wind turbines and related Subsea equipment.

During this project we ask that a 200m exclusion zone is maintained by  from all Hywind Scotland Wind turbines. 

See detailed map on our bulletin website

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.

Crew Transfer Vessel NR Hunter 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 East Anglia THREE, these areas shall as far as practicable be avoided during transits from 01st November to 31st March.

It is currently anticipated that weather permitting, operations will be carried out on a continuous basis (i.e. 24-hour working, seven days a week) ‘NR Hunter’ will remain on the project until construction is complete

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. 

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

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 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.

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.

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

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.

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.