News

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 Vessels (CTVs) “MHO Balder” and “MHO Boreas” 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.

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 Seafox 7 will be departing the SOWF array circa 6th November 2025 with the support of the following vessels: AHT Silex, AHT Vivax and AHT En Avant 10. 

The Valaris 248 will be arriving on site circa 10th November 2025 with the support of the following vessels: AHT Pacific Discovery, AHT Magne Viking and AHT Multratug 36. 

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 mid November 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 Vessels (CTVs) “MHO Balder” and “MHO Boreas” 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.

This will be conducted on behalf of Scottish & Southern Electricity Networks Transmission SSENT).Twice Daily crew transfers from Stornoway and Ullapool to the Aran 250 using a 12.5m CTV “Vigilant”. Towing of the jack-up to/from the work site at the start and end of project and subsequent moves between locations on-site. This will be conducted using the Leanne P.This phase of these works requires a Jack Up Barge (JUB) Aran 250 to be positioned for borehole sampling in the landfall(s) located at Arnish Point and Dundonnell within Little Loch Broom.A 200m 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.Programmed works will commence at Arnish from 28th October 2025.

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.

The marine survey activities for WL2 are due to commence on 28/09/2025, subject to weather. The near shore survey is due to be completed by 09/11/2025, subject to weather.

The surveys are to be conducted within the area shown by Figures 1 & 2, and updated coordinates are detailed in Tables 1, 2, & 3. The marine work consists of geophysical surveys. The surveys will be conducted by Fugro Seeker, vessel details and contact info provided in Figure 3 & Table 4. The MV Seeker will mobilise in Girvan. This vessel is equipped with both hull mounted and towed data collection systems. There is no intrusive work planned.

Operations Details

• Location: Approximately 3 nautical miles offshore Folkestone.

• Purpose: Marine survey of damaged section of the IFA 2000 cable.

• Dates: Scheduled to commence Wednesday, 5 November 2025 (weather permitting) and continue for several days.

• Hours of Work: Daylight hours only.

• Permit: Marine Management Organisation (MMO) licence EXE/2025/00256.

• Vessel:

  • Name: CERES III

  • Flag: Panama

  • GT: 10 tonnes

  • MMSI: 354075000

  • Operator: CERES (France)

• Crew: All French nationals holding valid French Seaman’s Books and passports. Additional personnel from RTE and LD TravOcean will be onboard for operational oversight.

• Port of Operation: Boulogne-sur-Mer, France. No embarkation or disembarkation is planned in the United Kingdom.

Mariners are advised

• To navigate with caution when in the vicinity of the survey area.

• Survey operations will be limited to daylight hours only.

• The CERES III will maintain a listening watch on VHF Channel 16 throughout operations.

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

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

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

Operations will be conducted on a 24-hour basis.

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 Multibeam echo sounder (hull mounted), sub bottom profiler (vessel mounted) and side scan sonar (towed) to provide geophysical data. The second pass using 2D seismic towed equipment to provide sub-sea floor data.

On behalf of Inch Cape Offshore Ltd, Noble Corp. shall conduct a rig move from the Inch Cape Offshore Sub Station platform to Invergordon. 

The jack up unit, Noble Resilient will depart the Inch Cape site on or around the 7th of November with the transit to Invergordon expected to be completed in three days.

An anchor handling tug shall tow the rig from the Inch Cape site to Invergordon, there shall be two assisting tugs in company during the tow.

On nomination of the anchor handling vessel and assisting tugs the vessel details shall be promulgated in a revision to this notice.

The Fugro Frontier is due to mobilise from the port of Ijmuiden on the on the 10th November 2025 to carry out offshore geophysical surveys within the proposed Mona Offshore Wind Project and Morgan Offshore  Wind Project (Generation Assets) array areas.The Fugro Frontier is expected to arrive on site on the 17th November, and conduct up to 9 days of  surveys in the Mona and Morgan Array Areas (Figure 1, Table 1, Table 2). The estimated survey end date is the 26th November, however surveys may extend until the 30th November. The Fugro Frontier will have limited manoeuvrability as the survey will involve towing a Sub-bottom Profiler (SBP) above the seabed at a speed of approximately 4 knots. An NFFO Offshore Fisheries Liaison Officer (OFLO) will be present on board the vessel during the survey and can be contacted via email and VHF Channel 16.Contact details for the FIR, OFLO and CFLO are provided below in section 7.

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

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

The approximate location of the dropped vibrocorer on the seabed was initially marked by a tethered Norwegian buoy. It is currently unclear if the Norwegian marker buoy is still buoyant and marking the hazard. Vessels are advised to avoid the area.

The recovery of the vibrocorer is in the planning stage and updates to this notice and the marine licence will continue until the object is safely removed.

Monopile Installation

The Offshore installation vessel, HLV Seaway Strashnov, has completed mono-pile foundations installations in the Dogger Bank C offshore windfarm construction area.

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

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

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

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

• At least 2 nm range.

Transition Piece (TP) Installation

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

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.

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.

The USVs will be mobilised from Scarborough or Hartlepool Harbour where each USV will be escorted out of the harbour limits, before transiting to the survey area. Survey Operations will be continuous 24hrs a day. Although vessels are uncrewed, they are managed remotely continuously using 360-degree cameras and other sensors.

The works will commence on the 03/11/2025, continuing until 03/12/2025 when all locations have been surveyed. The works will be continuous, 24 hours a day. A chart of the DBA and DBB Array Area including bounding coordinates is provided below. It is to be noted we are only surveying 49 locations on DBA (48 x WTG’s and 1 x OSP) and 96 locations on DBB (95 x WTG’s and 1 x OSP).

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

On behalf of Inch Cape Offshore Ltd, Enshore will commence export cable trenching activities at the cable joint locations shown below in the attached notice to mariners.

The trenching vessel, CMOS Installer shall utilise a controlled flow excavation trenching tool and a remotely operated vehicle (ROV) to trench the cable joints at KP 28 & 56. CMOS Installer is expected to arrive at the joint locations on or around the 8th of November to commence operations which are expected to be completed within seven days.

Construction Support Activities

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

The  Offshore Construction Support Vessel Grampian Eagle will join the project and conduct push on trials at various locations.

Dogger Bank B Array Area Geophysical Survey of WTG Foundations

On behalf of Dogger Bank A and Dogger Bank B Offshore Wind Farm, XOCEAN will be carrying out an MBES geophysical survey within Dogger Bank A and Dogger Bank B array area using remotely piloted uncrewed surface vessels (USVs).

The USVs will be mobilised from Scarborough or Hartlepool Harbour where each USV will be escorted out of the harbour limits, before transiting to the survey area. Survey Operations will be continuous 24hrs a day. Although vessels are uncrewed, they are managed remotely continuously using 360-degree cameras and other sensors.

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.

Dogger Bank A & B Array Area Geophysical Survey of WTG Foundations

 On behalf of Dogger Bank A and Dogger Bank B Offshore Wind Farm, XOCEAN will be carrying out an MBES geophysical survey within Dogger Bank A and Dogger Bank B array area using remotely piloted uncrewed surface vessels (USVs).

The USVs will be mobilised from Scarborough or Hartlepool Harbour where each USV will be escorted out of the harbour limits, before transiting to the survey area. Survey Operations will be continuous 24hrs a day. Although vessels are uncrewed, they are managed remotely continuously using 360-degree cameras and other sensors.

 The works will commence on the 03/11/2025, continuing until 03/12/2025 when all locations have been surveyed. The works will be continuous, 24 hours a day. A chart of the DBA and DBB Array Area including bounding coordinates is provided below. It is to be noted we are only surveying 49 locations on DBA (48 x WTG’s and 1 x OSP) and 96 locations on DBB (95 x WTG’s and 1 x OSP).

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.

The aerial survey operations will use Spectrum’s AeroMAG® UAMS payload to acquire data from a survey line plan within a corridor around the proposed cable route. 

The UAMS will conduct 12-hour, daylight-only operations. The UAMS platform will maintain a minimum safe separation distance of 50 m from all vessels underway. Survey personnel will continuously monitor VHF Channels 16 and 12 to maintain communication with local harbour authorities and other water users.

The aerial survey operations will use Spectrum’s AeroMAG® UAMS payload to acquire data from a survey line plan within a corridor around the proposed cable route. 

The UAMS will conduct 12-hour, daylight-only operations. The UAMS platform will maintain a minimum safe separation distance of 50 m from all vessels underway. Survey personnel will continuously monitor VHF Channels 16 and 12 to maintain communication with local harbour authorities and other water users

The aerial survey operations will use Spectrum’s AeroMAG® UAMS payload to acquire data froma survey line plan within a corridor around the proposed cable route. 

The UAMS will conduct 12-hour, daylight-only operations. The UAMS platform will maintain a minimum safe separation distance of 50 m from all vessels underway. Survey personnel will continuously monitor VHF Channels 16 and 12 to maintain communication with local harbour authorities and other water users

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.

The Inch Cape site demarcation buoyage noted below is unlit. Locations and coordinates are shown below in section 3. 

Plans for the repair of these demarcation buoys shall be promulgated in a revision to this notice.

·       North Cardinal demarcation buoy unlit.

·       South Cardinal 1 demarcation buoy unlit.

·       South Cardinal 2 demarcation buoy unlit.

·       Special Mark 6 demarcation buoy unlit.

See detailed map on our bulletin website

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.

Echosounder and clump weight

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

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

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

FLiDAR 1 anchor

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

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

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.

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.

Mariners and their equipment are requested to observe a safe working distance of 250m from all infrastructure at all times, unless otherwise communicated by Humber Gateway. It is also requested that mariners observe a distance of at least 500m when NORMAN SENTI NEL is manoeuvring into position for the safety of all sea users operating within the wind farm and to ensure NORMAND SENTINEL can safely position itself without negative interactions with sea users or their equipment. In order to minimise the risk of negative interactions, vessel activity, fishing gear, markers and anchors should also observe this safe working distance of 500m where works occur.

The Normand Sentinel will be accompanied by the following windfarm support vessels throughout:

• WINDCAT 31 - Callsign 2GBN9 MMSI - 235097407
• WINDCAT 33 - Callsign 2HER9 MMSI – 235103062
• WINDCAT 1 - Callsign - MFFA6 MMSI – 235018872

All vessels will be monitoring VHF Channels 16

CTVs will be regularly on site and mariners should keep a safe working distance of 150 m from these vessels where possible.

All mariners are requested to contact project Marine Coordination and monitor VHF CH16 when navigating or operating in the vicinity of the wind farm.

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.

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.

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 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.

Mariners are advised that Fugro, on behalf of Western Link 2 (WL2), will be undertaking survey work in the nearshore area of Caernarfon Bay.

Scottish Power Energy Networks and National Grid Electricity Transmission Plc are delivering the WL2 Subsea cable Project.

The WL2 project will play a vital role in achieving the UK, Welsh and Scottish Governments’ net zero targets; increase energy security and significantly increase the UK’s capacity for clean, green renewable power.

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 20/11/2025, 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 20/11/2025, 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 20/11/2025, 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.

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 November 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 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 Novemberer 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. 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.

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.

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

A passive acoustic lander is being deployed between mid-October and mid-November within Gwynt y Mor windfarm. The lander has a diameter of 1.5 m and and extends to ~ 2 m above the seabed. The system has a buoy on an acoustic release system and so there are no lines in the water or buoy permanently on the surface.  

Please be advised that Spectrum (on behalf of SEPD) will be undertaking a Geophysical Survey across a submarine electricity cable corridor in Haslar Lake.

The works will utilise the following platform to complete aerial survey operations:

â–ª AeroMAG® Unmanned Aerial Magnetometer Systems (UAMS) 

The operations will commence during an appropriate weather window following 27/10/2025 and will take place intermittently over a period of 4 weeks, weather permitting.

The operations will be conducted using Spectrum’s AeroMAG® UAMS payload (pictured below). The UAMS will be launched from nearshore bases and will conduct aerial survey operations within the designated survey area.

The aerial survey operations will use Spectrum’s AeroMAG® UAMS payload to acquire data from a survey line plan within a corridor around the proposed cable route. 

The UAMS will conduct 12-hour, daylight-only operations. The UAMS platform will maintain a minimum safe separation distance of 50 m from all vessels underway. Survey personnel will continuously monitor VHF Channels 16 and 12 to maintain communication with local harbour authorities and other water users.

Please be advised that Spectrum (on behalf of SEPD) will be undertaking a Geophysical Survey across a submarine electricity cable corridor at the caravan parking area across from Sticelett Farm, Tower FCO1. The works will utilise the following platform to complete aerial survey operations:

â–ª AeroMAG® Unmanned Aerial Magnetometer Systems (UAMS)

The operations will commence during an appropriate weather window following 27/10/2025 and will take place intermittently over a period of 4 weeks, weather permitting.

The operations will be conducted using Spectrum’s AeroMAG® UAMS payload (pictured below). The UAMS will be launched from nearshore bases and will conduct aerial survey operations within the designated survey area.

The aerial survey operations will use Spectrum’s AeroMAG® UAMS payload to acquire data from a survey line plan within a corridor around the proposed cable route. The UAMS will conduct 12-hour, daylight-only operations. The UAMS platform will maintain a minimum safe separation distance of 50 m from all vessels underway. Survey personnel will continuously monitor VHF Channels 16 and 12 to maintain communication with local harbour authorities and other water users.

Please be advised that Spectrum (on behalf of SEPD) will be undertaking a Geophysical Survey across a submarine electricity cable corridor down path to beach at junction of Inchmery Ln and Lepe Rd. 

The works will utilise the following platform to complete aerialsurvey operations:

â–ª AeroMAG® Unmanned Aerial Magnetometer Systems (UAMS)

The operations will commence during an appropriate weather window following 27/10/2025 and will take place intermittently over a period of 4 weeks, weather permitting.

The aerial survey operations will use Spectrum’s AeroMAG® UAMS payload to acquire data from a survey line plan within a corridor around the proposed cable route. The UAMS will conduct 12-hour, daylight-only operations. The UAMS platform will maintain a minimum safe separation distance of 50 m from all vessels underway. Survey personnel will continuously monitor VHF Channels 16 and 12 to maintain communication with local harbour authorities and other water users.

The aerial survey operations will use Spectrum’s AeroMAG® UAMS payload to acquire data from a survey line plan within a corridor around the proposed cable route. The UAMS will conduct 12-hour, daylight-only operations. The UAMS platform will maintain a minimum safe separation distance of 50 m from all vessels underway. Survey personnel will continuously monitor VHF Channels 16 and 12 to maintain communication with local harbour authorities and other water users.

The aerial survey operations will use Spectrum’s AeroMAG® UAMS payload to acquire data from a survey line plan within a corridor around the proposed cable route. The UAMS will conduct 12-hour, daylight-only operations. The UAMS platform will maintain a minimum safe separation distance of 50 m from all vessels underway. Survey personnel will continuously monitor VHF Channels 16 and 12 to maintain communication with local harbour authorities and other water users.

The aerial survey operations will use Spectrum’s AeroMAG® UAMS payload to acquire data from a survey line plan within a corridor around the proposed cable route. The UAMS will conduct 12-hour, daylight-only operations. The UAMS platform will maintain a minimum safe separation distance of 50 m from all vessels underway. Survey personnel will continuously monitor VHF Channels 16 and 68 to maintain communication with local harbour authorities and other water users.

On behalf of Beatrice Offshore Windfarm Ltd, the vessel DEME Rollingstone will install loose rock with a target depth of at least 0.6 metres in accordance with cable burial design criteria over two separate areas relating to the Beatrice Windfarm. A pre burial survey will be conducted by the vessel using GVI & Multibeam to confirm rock placement locations.

The second area involves a length of cable between F06 & OTM1 within the Windfarm and covers a total distance of approx. 500 metres made up of 6 individual points.

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

See detailed map on our bulletin website

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

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

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

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

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

•           At least 2 nm range.

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

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

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

The works will commence on 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. 

On behalf of Inch Cape Offshore Ltd, the Offshore Energy Group Ltd. has deployed six submerged Passive Acoustic Monitor mooring devices 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 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. 

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.

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.

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

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

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

Maintenance activities will include but not be limited to:

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

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

See detailed map on our bulletin website

Prior to TP installation, the installed Monopiles are marked with temporary lighting. At some locations it may not be possible to install the temporary lighting prior to TP installation. The MPs may therefore be unlit for short periods. Where possible, the unlit MPs will be restricted to the ‘in field’ locations and not the periphery locations. A range of other mitigation measures will be maintained.

The construction site is marked by boundary Cardinal and Special marks, which have been updated on navigational charts by NtM.

The DBC Guard vessel, Jacobus, will broadcast a safety message alerting vessels to this hazard. All construction vessels in the DBC construction site will maintain a lookout by all available means, RADAR, AIS and visual. All non-project vessels in the vicinity of DBC will be contacted and warned of the specific hazard.

All vessels are requested to navigate with caution in the vicinity of the Dogger Bank C construction site and where possible are requested to remain outside the construction site boundary.

A programme to replace the temporary navigation lights is being undertaken. Once all are restored an update will be published and this NtM withdrawn

• 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 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

On behalf of Inch Cape Offshore Ltd, Noble Corp. will position the self-elevating unit, Noble Resilient next to the Inch Cape Offshore Sub-station (OSP) structure, the Noble Resilient will be utilised as accommodation for OSP hook up and commissioning teams. 

Hook up and commissioning teams will access the OSP via a fixed gangway from Noble Resilient.

The Noble Resilient will be towed from Invergordon to the Inch Cape site by the anchor handling vessel Skandi Logger, the tugs Camperdown and Craigleith shall be in attendance throughout the tow. 

Once on location, the Noble Resilient will deploy an anchor spread to position itself next to the Inch Cape Offshore Sub-station platform, Skandi Logger will assist with anchor handling operations. Once in position Noble Resilient shall jack up to working height and connect the fixed gangway to the OSP.

Noble Resilient, Skandi Logger and the tugs Camperdown and Craigleith are expected to depart from Invergordon on Sunday the 10th of August at midday with arrival at the Inch Cape site expected on Tuesday the 12th of August. The rig is expected to remain jacked up on location for a period of up to three months.

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

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. 

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

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

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

See detailed map on our bulletin website

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

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

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

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

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

Works are expected to be completed by November 2025.

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.