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

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

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

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

Navigational Safety Advice

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

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

Survey Vessels

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

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

The guard vessel ‘Mimer’ will monitor vessel traffic in and around the East Anglia Three Windfarm 24 hours 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.

Weather permitting, guard vessel duties will be carried out on a continuous basis (i.e. 24-hour working, seven days a week) until the end of the construction period.The guard vessel ‘Mimer’ will monitor VHF Channel 16 and VHF DSC Channel 70 continuously throughout the operation as well as project specific radio channels.

The Sean export pipeline (PL311) will be surveyed using MBES, TSS pipe tracker and video survey performed by survey vessel Deep Vision. The vessel will mobilise to the UK pipeline location at adjacent to Bacton first and and survey KP0 to KP107 of the PL31.  The vessel will then mobilise to Sean Romeo and Sean Papa (block 49/25a), to complete the seabed and debris survey (and potential debris removal), and survey the Sean Romeo to Papa pipeline.  The vessel is in field currently.  Due to inclement weather this survey is not now expected to be completed until 17th November 2025.

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

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

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

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

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

Type See detailed map on our bulletin website

Type See detailed map on our bulletin website

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.

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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

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.

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.

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.

The vessel is expected to be on site between 5-7 days depending on weather and other operational conditions, and a notification will be issued to all parties once complete. The vessel will be restricted in ability to manoeuvre and will be displaying shapes as per COLREGs. 1NM clearance is requested by other vessels during cable operations, and 1/4NM from any cable buoys deployed during the course of operations. There will be three support craft assisting with the operation, one of which will be conducting survey along the cable route. 

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.

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 MMO has issued new 15 year marine licences to Tarmac Marine and Cemex UK Marine to dredge aggregates and acquire seabed samples from current aggregate dredging licence area 430. 

The new licence boundary is reduced in extent compared to the previous licence area.

Dredging operations will continue uninterupted under the new licences from 00:00 16/11/2025.

No changes to the current work programme are planned, with dredging continuing in the current active dredge zone, in Area 430 East.

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Please be advised that during geotechnical survey operations within the Morgan Array Area the Gardline vessel, Ocean Observer dropped a geotechnical vibrocorer on the seabed, as first reported in NtM_033v01 on 4th July 2025. The height of the dropped vibrocorer is approx. 7m above the seabed 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 (see Section 4 for recommended clearance distances).Recovery of the dropped vibrocorer is planned to be undertaken in the Morgan array anticipated to commence on 22nd November and estimated to complete by 3rd December 2025. Works may extend further into December dependant on weather. The dropped vibrocorer recovery will only occur in discrete/ targeted areas of the Morgan array.The dropped vibrocorer will be recovered utilising an ROV and divers to be deployed to inspect rigging and install replacement rigging. A crane will be deployed from the vessel ‘Boka Da Vinci’ for divers to connect to the replacement rigging. The vibrocorer will be lifted with the crane and monitored using an ROV.Updates to this notice will continue until the vibrocorer has been successfully removed.

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Harris and Barra fields are located in Block 201/24a of the UKCS, 160km to the East of Shetland, and apprcximately 500km North-North East of Aberdeen. The water depth in the area varies from approximately 150m to 165m. The Western Isles production storage and offshore vessel (FPSO) has been disconnected and offstation, but production trees and water injections trees via 9-off flexible risers, 2 -off dynamic umbilical's, 2 -off bundle systems with associated spools and jumpers, 2- off mid-water arches (MWA), FPSO mooring piles, concrete mattressess remain on location. Boka Northern Ocean will carryout some of the decommissioning works commencising in early April for up to 90 days on location, note only ROV's operations from the CSV Boka Northern Ocean for this part of the project.

The Valaris Norway is adjacent to the Cygnus Alpha, operating within the 500m zone. Anchors may extend beyond this point. 

*Please note that there is a slight delay between Cygnus A and Valaris Norway navigational aid activation, following assessment a dispensation has been approved under CL/63/8* 

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.

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. 

This array sall be serviced during the week commencing 10th November, works will be completed within 3 days.

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

Scheduled vessel dates are as follows...

Glomar worker mobilise on 14/09 - completing Dec 25

Ross Eagle mobilising on 17/09 - completing Dec 25

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

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

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

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.

We will be deploying mid water sensors in the area of upper Loch Linnhe, these sensors will be observed by ROV and AUV , there will be surface vessels in day time hours operating.

Loch Shiel and Ben Crom will be the main vessels for the duration although fast rescue vessel will be used to service vessels and conduct crew transfers.

Type See detailed map on our bulletin website

Type See detailed map on our bulletin website

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.

1.    Service SmartBuoy at West Gabbard 22.    Service SmartBuoy at Warp 3.    Service Seabed Noise Lander at Warp 4.    Service Seabed Noise Lander and CTD Rosette deployment at Dowsing 5.    Service Waverider at Southwold6.    Continuous flow/underway water sampling as required on various transects via onboard Ferrybox7.    CTD Rosette water sampling as required on various transects8.    Secchi disk deployment and Forel Ule sampling as required on various stations9.    Collection of zooplankton and phytoplankton sample at West Gabbard 210.    Collection of zooplankton and phytoplankton sample Warp11.    Collection of zooplankton sample East of Warp 

Equipment and staff training on environmental survey techniques including various camera deployments, seabed corer deployments, and waverider recovery and deployment in the North Sea

The vessel is the Royal Wagenborg MSV Kingsborg. The schedule is from 12th November to 12th December.

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 OBANA Heavy Lift Vessel will undertake jacket removal activities at the Pickerill A installation. Works will be between 15th December 2025 and 5th January 2026.

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The survey will carry out targeted investigations of possible UXO targets and crossings utilising an ROV (Remote-Operated Vehicles) from >10m water depth within Block 1 to Block 5 (See Figure 1 and Table 1 in attached PDF)  

 The vessel is estimated to arrive on location on the15th October, and the survey is expected to take ~ 16 days to complete (weather dependant) Updated 24-hour and 7-day lookahead positions of the 4-Winds will be provided throughout the survey period. 

 Mariners are advised to maintain a safe distance (of at least 500m) from the survey vessel locations at all times. 

 For further information, contact details for the Fishing Industry Representative and the Company Fisheries Liaison Officer are provided in Section 7 of the attcahed PDF. 

Five Estuaries Offshore Wind Farm Ltd deployed the LiDAR buoy on 15th November 2024 to assist in the site investigations and data collection for the future Five Estuaries offshore wind farm. In accordance with Marine Licence: L/2024/00473/1 the buoy will be recovered following 12 months of data collection, with all equipment being removed upon completion of licenced activities.

The location of the mooring is: 51° 55.745'N 002° 07.268'E.

Either the Green Isle or AMS Retriever shall be conducting operations during daylight hours. During the LiDAR buoy recovery operations, the vessel will be restricted in ability to manoeuvre. Mariners are therefore requested to pass at a safe speed and distance.

We kindly ask that all vessels in the local vicinity observe a 500m advisory safety zone at all times. It is requested that anyone having knowledge of any potential objects submerged or moored on the seabed at the survey area that could be damaged or form a hazard to the survey vessels and their equipment advises the Fisheries Liaison Officer of their position and nature.

During the recovery operations, the vessel will display the prescribed lights and signals for offshore operations and will be contactable on VHF Channels 16 at all times.

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.

The Affleck pipeline was installed, ploughed and backfilled earlier this year, during the backfilling operation a build of clay was experienced which resulted in a blockage of the backfill plough. This left a 2m heigh mound of clay on the seabed directly over the pipeline which could pose a hazard to fishing operations in this vicinity.

The backfill plough also experienced difficulties in another area which resulted in an area with blocks of clay circa 700mm high which could pose a hazard to fishing operations in this vicinity.

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.

The vessel will sail along the pipelines and conduct visual inspections by means of using a remotely operated vehicle (ROV).

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.

The works to install a new subsea cable and associated protection and stabilisation measures have been completed until further notice, and these are located within the corridor described below (Figure 1). Updates to nautical charts will be made following the completion of the as-built surveys.

The ERDA Jack-Up Barge will undertake hydrocarbon safe, pipeline flushing and well plug and abandonment works at the Trent installation. The ERDA will be located within the 500m exclusion zone. The ERDA will be at Trent from 24th September 2025 to 23rd December 2025.

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.

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.

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.

Mariners are advised the vessel "AMS SPIRIT" will be carrying out this work off Norfolk at Bacton, and off Lincolnshire at Mablethorpe. Two sampling sites will be located approximately 750m off the coast at Bacton, (B1 and B2). There are two sampling sites located at Mablethorpe, one approximately 4km off the coast (M1) and one approximately 6km off the coast (M2). 

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.

Continuation of Jackdaw Installation 2025/2026

New SSIV, tie-in spools and associated protection will be installed in the Jackdaw 500m zone between the Jackdaw Wellhead Platform and the new pipeline which was installed in 2024.

Sleipnir with associated barge and tugs working in and around the Jackdaw 500m safety zone. 

New electro-hydraulic umbilical and associated protection will be installed between Jackdaw Wellhead Platform and New Jackdaw SSIV.  Cooling Loop may be cleaned if required.

Sat 1st of November 2025 - The Deep Arctic vessel will carry out 4 hours of DP trials.

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.

Type See detailed map on our bulletin website

Type See detailed map on our bulletin website

Unknown object 

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.

Type See detailed map on our bulletin website

The cable removal works will be carried out by the MV Warrior (or similar vessel) and will be assisted by two pioneer support boats.

Contact details for the Fishing Liaison Officer and Fishing Industry Representative are provided at the end of this Notice to Mariners (NtM).

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. 

The Autonomous Underwater Vehicle will be deployed near shore and will navigate inside the study area (see attachment) for a period of 2-4 months. Every 2-4 months the AUV will be recovered and replaced with a new AUV that will again navigate the study area. This routine will continue for a year.

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

A subsea facilities inspection and hydrographics survey of the Blane infrastructure in the UKCS, to include the collection of ROV visual inspection and CP stabs of facilities and side-scan sonar (SSS) and multibeam echo-sounder (MBES) data collected across the area of the subsea 500 m zone. At its closest point, the proposed survey area is located approximately 264 kilometres (km) east of Peterhead on the Scottish coastline. The closest Blane subsea infrastructure to the UK/Norwegian median line is the Blane Production Tree PE wellhead located 0.2 km to the west. As such, the survey vessel may manoeuvre into Norwegian waters. The spatial extent of the survey area (including the greater working area) is 2.56 km2.

The survey will be conduced using the M/S Olympic Ares operated by Deep Ocean. The anticipated earliest start date for the proposed survey operations is the 31st  October 2025, with operations expected to take approximately 6 days to be completed, excluding weather downtime.  The latest completion date for the survey is the 30th November 2025, allowing for a delay to the start date.

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.

WGS84:  57° 09' 09.792''N, 002° 15' 28.554'' E

Clump weight: 500 kg steel ballast with mooring line attached

Deployment date: 02/10/2025

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.

Type See detailed map on our bulletin website

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.

Type See detailed map on our bulletin website

Type See detailed map on our bulletin website

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.

Type See detailed map on our bulletin website

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

Type See detailed map on our bulletin website

Type See detailed map on our bulletin website

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.  

Type See detailed map on our bulletin website

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.

Type See detailed map on our bulletin website

Type See detailed map on our bulletin website

Type See detailed map on our bulletin website

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.

Harbour Energy will completely remove and recover the topsides and jacket (including risers) of the Boulton BM and Munro MH platforms using the DEME Innovation Heavy Lift Vessel, which will return the sections of platform to shore for dismantlement and recycling. The vessel will mobilise between the 21st October – 28th October 2025 for approximately 25 days.

The DEME Rollingstone fallpipe vessel will perform rock placement at Munro MH to facilitate the DEME Innovation Heavy Lift Vessel scope of work. The vessel will mobilise between 23rd – 30th October for approximately 5 days.

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.

Type See detailed map on our bulletin website

Retrieval, maintenance and re-deployment of our offshore floating buoy with racks loaded with coated coupons. The purpose is to test and ascertain the effectiveness of various marine coatings in a harsh marine environment.The buoy was lowered into the water at Shorestore Marina, from where it was towed by Plymouth Quest to station. Once on station, Quest lowered the anchor to the seabed and attached the 150 meters of heavy chain to the chain link on the buoy. The buoy is visited monthly to sample the coated coupons and inspections are carried out to ensure the buoy is safe to remain on station.

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.

A78-06 shall be conducting ROV based geophysical surveys at approximately 1.5 knots using multibeam echosounder and sidescan sonar. The survey shall also comprise an environmental survey, of up to 12 stations. At each station the vessel shall complete ROV video transects and grab samples  

Throughout the duration of the survey, the vessel shall have restricted ability to manoeuvre. 

A78-06 shall be conducting an environmental survey in the Don Field. The survey shall comprise:

- ROV based geophysical surveys at approximately 1.5 knots using multibeam echosounder and sidescan sonar. This survey shall cover the former 500m zone and pipeline corridor between Don and Thistle. 

- Environmental survey, of up to 24 stations. At each station the vessel shall complete ROV video transects and grab samples. 

- ROV general visual inspection at the former Don Platform location.

Throughout the duration of the survey, the vessel shall have restricted ability to manoeuvre. 

Type See detailed map on our bulletin website

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.

Main Bearing MAjor Component Exchanges on 5 x WTGs

Type See detailed map on our bulletin website

Type See detailed map on our bulletin website

Type See detailed map on our bulletin website

Type See detailed map on our bulletin website

This is a survey on the RV Cefas Endeavour in and around the Kentish Knock East MPA or the Inner Bank MPA. Sampling will involve seabed sampling of sediments using a mini Hamon grab and drop down video, together with coring using a Nioz core and sediment images using a sediment profiling imagery (SPI) frame. Total survey time is approximately 5.5 days (24 hr operations) between 9th November and 14th November. 

Type See detailed map on our bulletin website

NtM Information Update – 29/09/2025 

Deployment has successfully carried out by the vessel BB Ocean, the vessel has returned to port to de-mobilise.  

The PAM survey consists of the placement of 12 PAM recording stations at fixed locations (via moorings anchored to seabed). All moorings will remain in place throughout the 12-month monitoring period. 

Equipment details are as follows: 

• 1 x ASCR Array: 7 x moorings deployed in a closely spaced configuration (~50 m separation between ARUs) 

• 2 x Localisation Arrays: 2 x seabed landers, within the ASCR array 

• 3 x Standalone Devices: 3 x moorings, distributed across the survey area for wider spatial coverage 

• 4 x cardinal marker buoys 

As-laid coordinates are provided in Table 1 and are illustrated in Figures 1, 2 and 3 below. Fishing vessel plotter compatible files are also included as attachments along with this notice. Mariners are advised to maintain a safe distance from the deployment locations at all times. 

For further information, contact details for the Fishing Industry Representative and the Company Fisheries Liaison Officer are provided in Section 7 of the attached notice. 

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.

Type See detailed map on our bulletin website

Type See detailed map on our bulletin website

Type See detailed map on our bulletin website

Cables included within this NtM are: 

1. Kerrera - Mull 2
2. Kerrera - Mull Replacement

The inspection works will be centred on a 50m cable corridor, defined by the start and end coordinates. All vessels are requested to pass at a safe speed and provide a minimum clearance of 500m (COLREGs Rule 16 & 18) during marine operations. All survey vessels will monitor VHF Channel 16 throughout survey operations.

Cables included within this NtM are: 

1. Kintyre - Gigha
2. Mainland - Jura
3. Islay - Colonsay
4. Mull - Coll

The inspection works will be centred on a 50m cable corridor, defined by the start and end coordinates. All vessels are requested to pass at a safe speed and provide a minimum clearance of 500m (COLREGs Rule 16 & 18) during marine operations. All survey vessels will monitor VHF Channel 16 throughout survey operations.

Cables included within this NtM are: 

1. Skye - Harris
2. Skye-South Uist [MAG Mask]

The inspection works will be centred on a 50m cable corridor, defined by the start and end coordinates. All vessels are requested to pass at a safe speed and provide a minimum clearance of 500m (COLREGs Rule 16 & 18) during marine operations. All survey vessels will monitor VHF Channel 16 throughout survey operations.

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

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

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

The survey will be carried out by Gardline using the MV Titan Discovery and/or the MV Titan Endeavour.  The survey will be collecting bathymetry data across each marine aggregate licence area along the south coast.  The survey was originally planned to start in April 2025 but is now to start early October and last approximately 2 to 3 weeks subject to weather.  It is intended for the vessel to start in the survey area located to the west of the Isle of Wight and then work eastwards along the coast.

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. 

The Vessel Armada 78 will be carrying Inspection Operations (Wells, Subsea Structures & Pipelines) in the vicinity of and between the locations noted below:

UPDATE - MOB DELAYED Dates Now = 18th September to 27th November 2025    (Approx 70 Days))

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Includes: Sidescan sonar, MB bathymetry, magnetometer (tbc)

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Perenco will conduct a geophysical (SBP, MAG,SSS, MBES and ROV), environmental (Grab samples and ROV) and geotechnical (VPT, CPT and borehole) survey at the proposed Platypus plarea, pipeline route and Neptune to gather information on the environmental conditions.

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2 x bottom-mounted ADCPs in J-shaped moorings to be deployed in Bloody Bay adjacent to the existing fish farm.  Each current meter will be mounted in a frame on the seabed, connected via leaded groundline to an anchored surface buoy within approximately 100m of the instruments. Amended - Moorings are marked with 2 x yellow A2 polyform buoys.

These will be deployed for a period of up to 4 months.

Coordinates:

Starting Point

1 Pilot station 57° 39.6'N 003° 53.4' W

Way Points

2 57° 46.6' N 003° 28.7' W

3 57° 43.7' N 001° 56.5' W

Final Location

4 Teal West 57°16’ 31’’N 00°46’ 28.76’’E

Concrete mattress protection has been installed at three cable crossing locations along the cable route. Further protection work is required at each cable crossing location expected to be completed by early 2026. A temporary safety zone of 1000m around each cable crossing location has been requested for all fishing activities. The coordinates of each location are provided below.

For further information please see the attached Marine Notice

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.

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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.

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Please be advised that the vessel CALYPSO will perform cable laying activities from early August 2025. Cable burial activities will be undertaken by three additional operational vessels: AETHRA, ATHENA, and SKAGERRAK. Please note there is a temporary +/- 1000m either side of the cable installation section to all fishing activities until works are completed.

There are also 7 guard vessels onsite: 

1. Defender

2. Resolute

3. Karima

4. Jason II

5. Lapwing

6. Accord

7. Star of Hope (support)

Additional guard vessels that may be used include:

• Gleaner
• Star of Faith
• Haulbowline 

Please note there is a temporary exclusion zone +/- 1000m either side of the cable installation section to all fishing activities until works are completed.

For further information on the cable installation works please see the attached Marine Notices and coordinates below.

The MV “Fruitful Harvest” PD50 has carried out a post decommissioning trawl verification sweep of the Chestnut Field concerning the locations noted below. In this area the seabed is fairly static and mostly sand and shells, in a water depth of 100-129 metres. Using best endeavours and practice available, we can confirm that at the time of these trials the majority of the swept areas were found to be safe for normal fishing operations – except the areas highlighted in the notes below.

Fishing vessels operating in the vicinity should do so with caution in the areas noted above.

Clump weight: 500 kg steel ballast with chain

Deployment date: 26/08/2025

Radius cone: ~120m  

Model: Datawell DWR Mk3 buoy

Diameter: 0.9 m

Colour: yellow

LED light: 5 flashes in 10 s 20 s repetition 360° around for 4 Nm distance

This is an update regarding the upcoming rig move for the Dolphin PBLJ. The rig will be relocated from the shipyard in Olen, Norway to the Caledonia 16/26-30Y Well to carry out P&A operations. The original submission dated 28th May indicated the Joanne Field as the destination; however, this has now been revised. The rig move is scheduled to commence on 1st September.

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

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• 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.

As part of its Water Resource Management Plan for the period 2025 to 2050 (WRMP24), Anglian Water Services has investigated and developed alternative water supply options which includes the abstraction and desalination of seawater. In service of this effort, Atkins-Realis, on behalf of Anglian Water, is coordinating the deployment of a water data buoy to collect water quality data off Lincolnshire at Mablethorpe, and off Norfolk at Bacton for a period of twelve months, commencing on 17/08/2025. The equipment deployed will include a  floating NexSens CB-450 Data Buoy secured by a seabed mooring system. 

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

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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.

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Mariners are advised that the University of Aberdeen has completed the installation of the moorings and equipment listed in the current notice.

Moorings support sound recording equipment, and / or acoustic loggers that record echolocation clicks of dolphins and porpoises. Subsurface moorings extend no more than 5 m vertically from the seabed. The two sites ~2 km east of the Port of Ardersier and the site near Chanonry Point and North Sutor are all surface-marked with a NB 40/NB 50 red surface float.

The recording equipment and moorings deployed at three locations between Ardersier and Findhorn will remain throughout the summer (for 12 weeks) and should be retrieved in October 2025. The recording equipment and moorings deployed at six locations around the Port of Ardersier will be serviced in the autumn and retrieved in February 2026. The recording equipment and moorings near Chanonry Point and North Sutor will be serviced in the autumn and in April 2026. 

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.

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An 8 inch oil production flowline will be installed (trenched and buired) from the exisiting GEEBB manifold (at Triton FPSO) to the new Belinda Valve skid located approx 5km south east of Triton. A 3 inch gas pipelines (piggy backed with the 8 inch) will also be was installed the same trence. 

A servise umbilical will be installed from the existing Evelyn valve skid to the Belinda valve skid located 7km north east of Evelyn. 

The works shall comprise the installtion of the following subsea pipeline or cable, or system of subsewa pipelines and cables:

- Bittern WI pipeline replacment and tie in spool

Dana intend to reinstate water injection at the Bittern field through installation of a new 12” water injection pipeline between the Triton FPSO and Bittern WA and WB XTs. The pipeline will be deployed by way of a pipelay vessel and laid on the seabed. The pipeline will subsequently be trenched and buried using a jet trencher. The pipeline will be accompanied by a number of jumpers and spools to tie-in to the water injection system. Rock placement, grout bags and mattresses may be required over the length of the pipeline.

As part of the system, they intend to install a 33.3 m tie-in spool connecting the new water injection pipeline (PL6609) to the WB XT. A combination of grout bags and concrete mattresses will be used to protect the pipeline.

The Works shall be located at: 57 04' 58.69" N, 00 53' 20.47" E Block 21/30.

The structure will be loaded onto the installation vessel in Peterhead and seafastened before undertaking the short transit to the field. Upon arrival, the seabed will be prepared by the temporary installation of transponder beacons to allow accurate positioning. The ship's crane will pick up the structure and overboard it clear of any subsea assets. The vessel will then step into the desired location and lower the structure to the seabed. The ship's ROV will disconnect installation rigging and recover all transponders and a structure based gyro.

As the structure is required to be located within the FPSO swing circle, heading control will be arranged for the FPSO to maintain a safe clearance between the FPSO and construction vessel. Once installed no further navigation aids are required.

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

Operation of 6 Kelpedo seaweed units within a 600m x 100m licensed array area commencing from the 25th February 2025.  

Kelpedo units will remain in position until March 2026. Monthly maintenance and inspection of the array will be undertaken by the R.V. Fortuna. During operations R.V Fortuna will be restricted in its ability to manoeuvre and will display appropriate day shapes and light in accordance with COLREGs, alongside transmitting its position on AIS.

The site will consist of 6 modular scientific KelpedoTM units, with each comprising of anchor weight, rising chain and riser rope, custom version of a KelpedoTM and a HDPE special marker buoy. Units will be sequentially number 1 – 6 from North to South.

The special marker buoys are bright yellow HDPE pillars, 1.5m in height, with an integrated reflector, St Andrews Cross and a 360° yellow warning light. Lighting Sequence FL(5) Y 20s. 

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UKCS Block ID: 211/13a and 211/14a 

Water Depths refer to Lowest Astronomical Tide (LAT) with all depths quoted in metres. 

No visible marker (marker buoys) will be deployed. 

Schematic drawing has been attached.

Will be in combined operations (COMOPS) for approximately 180 days supporting ctivities for CCS (Carbon Capture & Storage)

This oil & gas drilling rig has moved to this new position. Rig are protected by a 500m safety zone and some may have anchors extending beyond this zone.

Dear Sir, Madam 

We would like to inform you of an important development in our marine management. A research project for oyster bank recovery will soon be implemented at certain locations within the Belgian part of the North Sea. This will take place from June 2025 at the following locations with coordinates around which a radius of 200m will be drawn:  - Location 1: 51.39573 - 2.497253 .This is where the Kilmore wreck, protected by law, is located. This area was selected because a safety zone is already present here.  - Location 2: 51.39235 - 2.504558.

These are also shown on the map below. Therefore, as one of the frequent users of this zone, we would like to give you additional information. The locations (a circle with radius 200m) should be avoided for bottom disturbance. This will be communicated through a BaZ. 

Specifically, these recovery measures consist of placing structures sown with oysters on the seabed. The oysters were raised in the Netherlands. A Belgian fishing vessel will be involved in the installation at sea, to explore how this cooperation can be strengthened in the future. To give the oysters a chance to grow, they must remain undisturbed at all times. On top of that, the structures can cause major damage to the nets or the catch. Therefore, it is very important that you do not disturb these areas with bottom disturbing fishing techniques or anchors, etc.   

We also want to let you know that enforcement will take place to ensure that prohibited activities are not within the designated areas. 

We understand that this may cause inconvenience, but count on your cooperation to ensure that the oyster bank recovery activities are successful and thus support the environment. If you have any questions or would like more information, please feel free to contact us by phone or email. 

Thank you for your understanding and cooperation. Kind regards,

Wim Deschutter, Technical expert marine pollution control | DG Environment | Marine Environment wim.deschutter@health.fgov.be Tel: +32 (0)2 524 9016 - GSM: +32 (0)475 666 772

and

Merel Oeyen, Policy officer Marine Environment| DG Environment merel.oeyen@health.fgov.be Tel: +32 (0)2 524 69 67 - GSM: +32 (0)478 67 65 05

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.

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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. 

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