News

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 (Block 61) shown by Figure 1, the coordinates for this area can be provided upon request.

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 31st of March 2026 , 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.

Jack up Location    GAE05    Gear Box    51° 45.881' N    1° 58.654' E    

Jack up Location    GAF05    Gear Box    51° 45.077' N    1° 58.938' E

Jack up Location    IGI01    Main Bearing    51° 57.702' N    1° 59.885' E

Jack up Location    IGK03    Main Bearing/ Gear Box/ Generator    51° 52.817 N    1° 58.188' E

Jack up Location    IGC06    Generator    51° 54.486' N    1° 52.373' E

Jack up Location     IGF10   Gearbox    51° 51.618' N    1° 53.892'E

Jack up Location     IGD04   Gearbox    51° 56.820' N    1° 54.480'E

DUE BACK TO THE WINDFARM ON 14TH/15TH MARCH AFTER PORT CALL

Pre Jack up seabed survey - Locations 

we will re visit the UXO location and the X-18 debri location 

Post collision debris survey    X 18    51 55.229'N    01 58.244'E UXO location    UXO    51 57.924’N    001 56.122’E

IGD04 - 51'56.820'N 001'54.480'E

IGF10 - 51'51.618'N 001'53.892'E

EGL2 are due to commence an unexploded ordnance (UXO) target investigation ROV survey on the 2nd of March 2026.

The works are to be conducted within the Exclusion Block (Block 42). 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 31st of March 2026, 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.

The 17 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.

This campaign will commence around 16th March 2026 and continue until approximately 15th of April 2026. The works will be continuous, 24 hours a day. Charts of the DBC array area are provided below.

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

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

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

All mariners are advised that MPI Adventure will be carrying out maintenance operations at Rhyl flats Offshore Wind Farm from 20/03/2026 until 10/04/2026. These dates are subject to weather and sea conditions. Specific coordinates of locations where works occur are found below.

Works Locations

Mariners must observe the safety zone of 500m when the MPI Adventure is attached or anchored next to RF14, RF18 & RF07. It is also requested that mariners observe a distance of at least 500m when MPI Adventure is manoeuvring into position for the safety of all sea users operating

All mariners and their equipment are requested to remain at least 500m from all infrastructure at all times. CTVs will be regularly on site and mariners should keep a safe working distance of 500 m from these vessels where possible

Drone Blade Inspections across 4 x WTG locations operating from Service CTV 

The geophysical survey will be conducted within the Caledonia OWF Site however, as the aim of the survey relates to potential location of wind turbines, no survey operations will occur within the Structure Exclusion Zone (SEZ) in the south east of the site (please see map in attached NtM). Simultanous operations will be undertaken by two vessels to confirm risk of Unexploded Ordnance (UXO) is As Low As Reasonably Practicable (ALARP), and obtain necessary geophysical data.

Caledonia will issue a Weekly Notice of Operations (WNoO) by email and publish on the Caledonia website each Thursday during periods of active survey operations. If you would like to be added to the distribution list, please contact Caledonia Consents (details below).

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) “Purus Power” & Daughter craft “Purus 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 Vessels (CTVs) MHO Balder and MHO Gurli 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.

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 March 2026 (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 Jaguar 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) “Purus Power” & Daughter craft “Purus 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 Vessels (CTVs) MHO Balder and MHO Gurli 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.

There will be various vessels associated with the works. The vessels will be limited in manoeuvrability therefore, vessels working in the area should proceed with caution within 1NM from the cable ship during operations and all activity should remain clear 250m either side of the vessel, 500m corridor in total. Please distribute this information accordingly so that other sea users are aware.

Please contact myself Adrian Carter, Permitting Manager (adrian.carter@oceaniq.co.uk) or Chris Butler, Project Manager (chris.butler@globalmarine.group) if you have any queries regarding this notification or if you have any information on any underwater activity in this area that is relevant to the operation.

The Seapiper will work at locations where post cable lay burial operations require an additional level of depth protection. 

The vessel will transit directly from the loading quarry in Norway to site and will not use any UK port.

Mariners are requested to remain where possible 500m from vessels and equipment. Fishing vessels are requested to pass at a safe speed and distance.  

During these rock placement works the “Seapiper” will be restricted in its ability to manoeuvre as it carries out the rock placement work and shall also be always exhibiting the correct day shapes/lights. 

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

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

Note

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' continues monitoring operations within the Sofia Export Cable Corridor between KP4 & KP90 and shall be monitoring VHF 16 during their scope of the works.

Please be advised that there will be a short CPT programme of work (approximately 9 days excluding weather) at the Kincardine Field. The scope of the operations is:

·        CPT seabed investigation in close proximity to each floating platform

A Cone Penetration Test (CPT) is an in-situ geotechnical method where an instrumented, small diameter cone is pushed into the seabed at a constant rate to measure soil resistance, and other soil properties.

The work is expected to start around 16 March 2026.

Survey vessel will be Dina Polaris, which will be listening on channel 16 at all times

See detailed map on our bulletin website

Construction Support Activities  

The Service Operations VesselS (SOV) Grampian Tweed and Grampian Tyne will carry out construction support activities at the Offshore Substation Platform in the DBC construction site and at various WTG locations.

Full multi-beam bathymetry survey of the London Array Windfarm. The survey will commence out of Ramsgate and will be acquired onboard the Spectrum 1, a 21m catamaran. Currently there is no towed equipment on the vessel.

Please be advised that Briggs Marine Contractors (on behalf of SHEPD) will be undertaking an ROV survey across a cable route corridor, situated within the boundary identified in the attached Notice to Mariners (NtM).

This work will utilise the vessel ‘Challenger’. Survey campaign operations are expected to commence between 5th and 11th March and are expected to continue for 7 days (commencement of operations and duration are subject to weather).

Survey operations will use the Challenger vessel. The vessel will acquire data from survey line plans around the proposed cable route. An additional larger operational area around the survey area will be utilised for vessel manoeuvring.Survey work will be undertaken on a 12-hour daytime basis. During operations, the vessel will be restricted in its ability to manoeuvre.Should any vessel with to come within 250m of the survey vessel, then direct communication with the Master is required.The vessel will display the appropriate lights / shapes for their operations.

The following equipment will be recovered from site:

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

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

Construction Support Activities

The Offshore Construction Support Vessels IWS Skywalker and Boreas Enabler will continue with ongoing construction support activities within Dogger Bank B construction site.

Wind Turbine Generator (WTG) Installation

he Jack-up WTG Installation Vessel, Voltaire, will continue installation of wind  turbine generators (WTG) within the Dogger Bank B construction area. The works commencing in February 2026, and will be continuous, 24 hours a day, for the duration of the WTG installations. 

During operations,all vessels 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.

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 Sunwalker and Norwind Helm will continue with ongoing construction support activities within Dogger Bank A construction site. 

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 have developed an Environmental Monitoring and Mitigation Plan to safeguard marine wildlife. The findings will be made 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 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 has been redeployed in the Morlais zone for a further 18-month period of data collection.As this period of research and development comes to a close, the MCRP wish to notify you of the demobilisation of the Marinus buoy circa early April, weather dependent.

XOCEAN is planning the collection of geophysical data using a remotely piloted Uncrewed Surface Vessel (USV) in the Aberdeen Offshore Wind Farm (OWF), approximately 2.4km off the coast of Blackdog, Aberdeenshire. The USV is expected to operate out of Peterhead for the full survey duration. A crewed Support Vessel will be chartered throughout the survey to support the USVs with departures and arrivals from Peterhead and assist in towing them back in if a technical issue occurs.

Dates/Duration: Operations are expected to commence around 18 March 2026. It is expected that the survey activities shall be completed within 10 days (subject to weather).

Survey Area: Figure 1 below indicates the operational area. This is outlined in the attached NtM also.

Fishing Gear Clearance: No fishing gear clearance is presently being requested for these surveys.

Exclusion Area / Closest Point of Approach: Seafarers are kindly asked to provide a clearance of >500m from the USVs at all times when they are in operation.

Support Vessel: The USVs operations will be supported by a crewed Support Vessel.

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.

Please be advised that SHEPD will be undertaking remedial works within the intertidal area at Daal on Whalsay, Shetland.

Proposed works involve the replacement of split-pipe protection and reburial where necessary of an existing subsea power cable in the intertidal area between Mean High Water Springs and Mean Low Water Springs.

Works are proposed to commence from 10th March and complete by 15th March.

Work DescriptionSite personnel will remove and replace split-pipe cable protection where necessary and then reburial exposed sections of cable within the intertidal area using a small excavator.Works will be undertaken during daylight hours at low tide and will be accessed from the land with no vessels involved in the works or access to site.

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 in the attached NtM.

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.

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

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

Survey vessel: VOE Vanguard (IMO 9809693; MMSI 232008636; Call Sign MEBN9

On behalf of Inch Cape Offshore Ltd, Seaway 7 shall commence the installation of 54 WTG foundation transition piece components.

The transition pieces will be transported from the Port of Leith to the Inch Cape site and installed by the heavy lift vessel Seaway Alfa Lift.

Alfa Lift is expected to arrive at the Inch Cape site on or around the 17th of March to commence installation which will continue for several months, further details are in the attached notice to mariners.

EGL2 are due to commence an unexploded ordnance (UXO) target investigation ROV survey on the 9th of March 2026.

The works are to be conducted within the Exclusion Block (Block 3) shown by Figure 1, the coordinates for this area are provided in Table 1.

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 April 2026, 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.

Notice will be updated once we have confirmed timeline for repair or buoy is functioning as expected.

XOCEAN is planning the collection of geophysical data using remotely piloted Uncrewed Surface Vessels (USVs) along a proposed cable route corridor in Orkney, from the islands of Sanday to North Ronaldsay. The USVs are expected to operate out of Westray Marina for the full survey duration. A mix of USVs with 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 Westray Marina and assist in towing them back in if a technical issue occurs.

Dates/Duration: Operations are expected to commence around 01 March 2026. It is expected that the survey activities shall be completed within 30 days (subject to weather).Survey Area: Figure 1 below indicates the operational area which is shown by the darker green area. This is outlined in Table 1 below also.Fishing Gear Clearance: No fishing gear clearance is presently being requested for these surveys.

Exclusion Area / Closest Point of Approach: Seafarers are kindly asked to provide a clearance of >500m from the USVs at all times when they are in operation.

Support Vessel: The USVs operations will be supported by a crewed Support Vessel. XOCEAN plan to charter in the Northerly Explorer, owned and operated by Northerly Marine Services Ltd and be based at Westray Marina.

Please be advised that Aspect Land & Hydrographic Surveys Ltd (on behalf of SHEPD) will be undertaking subsea inspections across the Outer Hebrides marine areas.

Given the different conditions and water depths anticipated at each site, a range of vessels will be available for the project. The inspection works will be centred on a 50m cable corridor.

Vessel Details

The vessel conducting the works will be restricted in its 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.

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

Please be advised that Aspect Land & Hydrographic Surveys Ltd (on behalf of SHEPD) will be undertaking subsea inspections in the Argyll marine areas.

Given the different conditions and water depths anticipated at each site, a range of vessels will be available for the project, detailed in the attached NtM. The inspection works will be centred on a 50m cable corridor,

LOCATION DETAILSCable location and indicative survey corridors are noted below 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 DETAILSThe 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.

IWS Windwalker and supporting CTVs will commission 95 WTGs at the locations set out in section 2.2 ofEAT NTM 008-2026 Wind Turbine Generator Commissioning Campaign.Installed WTGs shall be marked with the following aids to navigation:LightsFl Y 2.5s light (visible through 360°)Minimum 2 nm range

Partially constructed monopiles shall be marked with the following aids to navigation where a transition piecehas not been installed:

LightsFl Y 2.5s light (visible through 360°)Minimum 2 nm rangeWeather permitting, offshore works will be carried out on a continuous basis (i.e. 24-hour working, seven daysa week).During operations, the IWS Windwalker will have restricted manoeuvrability as defined under COLREGS(International Regulations for Preventing Collisions at Sea, 1972). They will display the appropriate day shapesand lights and will transmit an Automatic Identification System (AIS) message.

Program Schedule:The IWS Windwalker will mobilise at the Port of Lowestoft, with first commissioning activitiesanticipated to start around 18/03/202

The CTVs will mobilise at the Port of Lowestoft and support the IWS Windwalker throughout thecampaign.

WTG installation is expected to be completed end of Q4 2026.

See detailed map on our bulletin website

Please be advised that Aspect Land & Hydrographic Surveys Ltd (on behalf of SHEPD) will be undertaking a subsea inspection in the Outer Hebrides marine area. 

Given the different conditions and water depths anticipated on site, a range of vessels will be available for the project.The inspection works will be centred on a 50m cable corridor, defined by the start and end coordinates listed in this notice.

Cable location and indicative survey corridors are 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.

Wind Osprey and Wind Pace will install 95 WTGs

Installed WTGs shall be marked with the following aids to navigation:

Lights

• Fl Y 2.5s light (visible through 360°)
•  Minimum 2 nm range

Partially constructed monopiles shall be marked with the following aids to navigation where a transition piece has not been installed:

Lights

• Fl Y 2.5s light (visible through 360°)
• Minimum 2 nm range

Weather permitting, offshore works will be carried out on a continuous basis (i.e. 24-hour working, seven days a week).

During operations, the Wind Osprey and Wind Pace 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.

Please be advised that Briggs Marine Contractors (on behalf of SHEPD) will be installing cable protection on a subsea cable at Iona. 

During operations the Flow West will be beached at the landfall site, at the location detailed in table 2 of the attached NtM. The operations involve installing cable protection onto an existing subsea cable. Whilst operations will seek to minimise disruption in the beaching location, some disruption may be unavoidable during operations within the working area.

Operations will be conducted during day light hours only and are weather/tide dependent.

Should any vessel wish to come within 250m of the vessel, then direct communication with the Master / Operator is required. Vessels will display the appropriate lights/day shapes for their operations.

Please be advised that Briggs Marine Contractors (on behalf of SHEPD) will be carrying out cable burial works on the beach at Kilmalieu. 

During operations there will be an excavator on the beach at the location detailed in Table 1 of the attached NtM. The operations involve further trenching the newly installed subsea cable. Whilst operations will seek to minimise disruption in the location, some disruption may be unavoidable during operations within the working area.

Operations will be conducted during day light hours only and are weather/tide dependent.

Please be advised that Briggs Marine Contractors (on behalf of SHEPD) will be carrying out cable burial works on the foreshore at Tiree.

During operations there will be an excavator on the beach at the location detailed in Table 1 of the attached NtM. The operations involve further trenching the newly installed subsea cable. Whilst operations will seek to minimise disruption in the location, some disruption may be unavoidable during operations within the working area.

Operations will be conducted during day light hours only and are weather/tide dependent.

• The steel wire rope sections are assumed to be remnants of discarded trawl wire or anchor cable and are now partially exposed above seabed level.
• 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.
• A substantial amount of wire remains buried beyond each of the location ends detailed below.

• The steel wire rope sections are assumed to be remnants of discarded trawl wire or anchor cable and are now partially exposed above seabed level.
• 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.
• A substantial amount of wire remains buried beyond each of the location ends detailed below.

See detailed map on our bulletin website

See detailed map on our bulletin website

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

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

Mariners are advised to exercise caution in the vicinity of the identified locations and to avoid anchoring directly over the affected area. Additionally, mariners are advised to maintain a safe distance from the vessel, Glomar Wave, while it is conducting UXO target investigations. A 500m Exclusion Zone around the UXO position has been enacted. Mariners are advised to observe this measure to ensure safe navigation and to avoid any potential hazards.

• The steel wire rope sections are assumed to be remnants of discarded trawl wire or anchor cable and are now partially exposed above seabed level.
• 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.
• A substantial amount of wire remains buried beyond each of the location ends detailed below.

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.

NKT will perform Rock Filter Unit (RFU) installation at the East Anglia 3 Offshore Converter Station using the vessel Olympic Taurus. Operations will be conducted continuously, 24 hours a day. The work will be performed in a single campaign. RFUs will be installed at the export cable free spans exiting the platform. 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.

This work is due to take place between the 07/03/2026 and 21/03/2026 within the Rampion OWF Area, depending on weather. The works involves; MBES inspection on 36 x WTG locations, 33 x inter-array cables, 2 x export cables 1 x perimeter of substation.

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 12th of January 2026 and are expected to complete approximately end of February 2026.

Eastern Green Link 5 Geophysical survey area consists of multiple Notice to Mariners referenced below (this notice is highlighted in bold):

NtM_EGL5-SSEN-MAR-XX-CO-MC-004

NtM_EGL5-SSEN-MAR-XX-CO-MC-001 - Geophysical survey area outside 12nm

EGL5-SSEN-MAR-XX-CO-MC-002 – Geotechnical survey area outside 12nm

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.

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.

All mariners and stakeholders are advised that a Passive Acoustic Monitoring (PAM) mooring array for the purpose of monitoring marine mammals’ detections is currently deployed along the east coast of Scotland, within 2 km of the coast, between St Andrews Bay and Inverbervie.

The PAM array will remain in situ for 2 years (i.e. up to August 2027) with a service interval every 3 months. The moorings will not be surface marked as the top of the mooring extends approximately 4-7m above the seabed.

 During a servicing trip on Saturday 21st February, an item has been dropped to the sea during the recovery of the Passive Acoustic Monitoring mooring at Carnoustie, coordinates shown in the attached notice to mariners.

One PAM mooring was redeployed during the service trip on 21 February 2026, locations and coordinates for the passive acoustic monitors currently in place are shown in the attached notice to mariners.

Between the 1st March and the 18th April 2026 (subject to weather delays), mariners must observe an approved safety zone of 500m whenever the Geoquip Elena vessel is carrying out essential maintenance work at WTGs C02 or A02 (see chart provided). A minimum separation distance of 500m is also requested when the vessel is working between these WTG positions or observed manoeuvring into position. Note that the Geoquip Elena shall be considered as limited in manoeuvrability, as defined within the COLREGs (1972).

The Iceni Warrior and Iceni Defiant (CTVs) will be supporting the Geoquip Elena with the maintenance work.

See detailed map on our bulletin website

Mariners are advised that a marine cable route survey is planned for the proposed Shetland HVDC Link 2 cable. The survey will involve geophysical, geotechnical and benthic surveying. SSEN Transmission conduct marine surveys to gain information on seabed morphology, installation design, sediment structure and to gain benthic characterisation and habitat mapping.  All the collected data provides the project with the best understanding on the marine environment to install the cable the best we can.  SSEN Transmission plan to commence the marine survey outside 12NM on 23rd February 2026. The survey equipment will consist of Multi Beam Echo Sounder (MBES), Side Scan Sonar (SSS), Sub-Bottom Profiler (SBP), Magnetometer, and visual survey. Geophysical survey sensors will be ROV mounted.  The survey equipment will also require calibration testing, which will be conducted within the survey corridor.

The offshore survey works are being carried out by Reach Subsea UK Ltd. They are expected to be complete all survey works approximately August 2026.

Cable‑laying operations will continue to be conducted within the East Anglia THREE Offshore Windfarm by CLV Seaway Aimery. The vessels will install subsea cables between WTGs and the Offshore Converter Station (OFCS). The Grand Canyon 3 will conduct trenching and burial operations supporting the Cable-Laying operation. During cable deployment, trenching & burial, both the vessels will be restricted in their ability to manoeuvre.The Seaway Aimery will carry out cable laying activities, and be supported by the Seaway Moxie & Windea Clausius, which will both undertake equipment and personnel transfers to WTGs and the OFCS via a Walk‑to‑Work (W2W) gangway system. While conducting these transfers, the Seaway Moxie & Windea Clausius will also be restricted in manoeuvrability.

For further information regarding Inter Array Cable Installation Operations, please see attached East Anglia THREE Notice To Mariners 006-2026 Inter- Array Cable Installation.

The works will commence around the 21st of February 2026 continuing until approximately Q2 2027.  The works will be continuous, 24 hours a day.  A chart of the DBB 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

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 (see Table 1 and Figure 1) are requested to provide the coordinates of such deployed gears 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-oflostgear#marking-of-fishing-gear).

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 advised that from 18/02/26 to 31/03/26, 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 “Dutch Power”.

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.

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 28th of February 2026. Precise date dependent on progress of tow 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.

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

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.

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)

OverviewMariners are advised that North Falls Offshore Wind Farm (NFOWF) will undertake a metocean survey within the Wind Turbine Array Area, at the Primary and Secondary locations shown in Table 1 and Figure 2.

Survey Duration Mobilisation will commence on or after 18 February 2026, with the metocean survey lasting between 12 and 18months. The planned survey end date will be no later than 16 August 2027.

Survey Tasks The metocean survey work is being undertaken by Partrac, who will use the vessel CT Vector to deploy the metocean equipment at the Primary and Secondary locations shown in Table 1 and Figure 2. It is expected that the deployment operation will last for one day.

The metocean equipment will consist of one seabed frame deployed at each location (i.e., a total of two seabed frames). Each seabed frame will be equipped with an acoustic Doppler current profiler (ADCP) and additional sensors (temperature sensor, water-level sensor, and turbidity sensor). Each seabed frame will be connected to a clump weight, with approximately 100 m leaded polypropylene ground line between the seabed frame and clump weight.

As a consequence of equipment being deployed, all mariners are advised to keep a safe clearance distance of no less than 500 m from the deployment vessel and metocean equipment deployment locations. No towed survey equipment will be deployed from the vessel.

See detailed map on our bulletin website

CTV - HST Tynemouth supporting service operations over the summer months commencing 1st March 2026 

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 a separate notice (ID-5431).

Search and recovery scheduled for November 2025 to April 2026.

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

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 detail of Seabed Met-Ocean Buoy Moorings that remain in place at SOWF (Excluding Buoy).

This is to raise awareness of the upcoming turbine retrofit works that will be taking place within the Moray Offshore Windfarm (West) Limited (Moray West). Works are due to commence on 11th February 2026 for approximately 5 weeks. Service Operations Vessel (SOV) Norwind Hurricane will be on site for the duration to complete a retrofit on all 60 turbines.

Mariners are advised that post-lay burial cable protection works are due to commence along the NeuConnect UK cable route. Works will be conducted by Prysmian PowerLink and supported by their subcontractors.

Post-lay burial cable protection works will be undertaken at cable joints and any locations where the cable is not at the desired cable burial depth, using a jetting tool on board a trenching support vessel. Where this does not achieve the required burial depth, a Controlled Flow Excavator (CFE) will be used. The precise location where post-lay burial is required will be dependent on data from accompanying survey activity, which will be ongoing throughout the works.  

Post lay burial protection operations will take place between the following locations set out in the attached Notice to Mariners (Table 1), commencing from 15 September 2025. Dates are subject to change due to weather or operational requirements.

Post-lay cable protection locations for cable crossings are detailed in the attached Notice to Mariners (Table 2). The crossing protection operations will take place for approx. one week from 15th December 2025. Dates are subject to change due to weather or operational requirements.

Guard vessels are planned to patrol the route sections where the cable is exposed (cable crossings) or at inadequate depth until cable protection works are completed. Guard vessels will not operate within the Outer Thames SPA (KP 5 to KP 81) between 01 November 2025 to 31 March 2026.  

Seabed users are politely requested to avoid this areas due to the risk of snagging any equipment in contact with the seabed.

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.

All mariners and stakeholders are advised that the recently installed temporary navigation light on the P32 monopile has been reported as unlit.

Venterra are planning to deploy two Floating LiDAR Buoys in the area around the NOAH Met Mast. Deployment operations are expected to take place on or around Monday 02nd February 2026, weather permitting. The two buoys will remain on station for a minimum of 1 month.

Marine users are advised to always maintain a 500m separation from each buoy and operational vessel at all times.

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.

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

On behalf of Inch Cape Wind Ltd. Jan de Nul will commence the installation of wind turbine generator foundation monopiles. The monopile components will be transported from the Port of Leith to the Inch Cape site and installed at 54 locations within the wind farm boundary.

The installation vessel Les Alizes is expected to arrive at Inch Cape to commence operations on or around the 25th of December. Each monopile will be installed with a lit temporary navigation structure, the light shall exhibit Flashing (Fl) Yellow (Y) 2.5 seconds (s) 

Monopile installation is expected to continue until May 2026.

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.

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.

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.

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.

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.

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.

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

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.

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.

See detailed map on our bulletin website

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

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.

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.