News

The following equipment will be recovered from site:

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

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

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 January 2026 (TBC)

An eight legged jacket with 8 driven pin piles has been installed as a foundation for the OCP followed by the OCP itself.

The Sofia Offshore Wind Farm Boundary Co-ordinates where the works will take place are provided below.  All non-project vessels are requested to remain outside this area.

Mariners are requested to remain where possible 500m from vessels. During these works, SOVs will have restricted manoeuvrability and shall also be exhibiting the correct day shapes/ lights and flag for vessels engaged in diving operations and restricted in ability to manoeuvre.

Emergency Response & Rescue Vessel

The EERV Putford Protector is supporting the commissioning phase of the Offshore Converter Platform, providing close standby cover as required during overside works.

Service Operation Vessels

The Service Operations Vessel (SOV) “Rem Power” & Daughter craft “Rem Transporter” continues to support the SOWF project throughout the construction of the offshore windfarm.

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

SOVs shall be transiting to / from the Sofia Array and the port of Blyth / Sunderland throughout this period.

Crew Transfer Vessel

The Crew Transfer Vessel (CTV) MHO Balder continue operations at the Sofia OWF. 

All Mariners are advised to always give a wide berth of approx. 500m metres from the above vessels. The vessels shall be exhibiting the correct day signals / night lights for the operations as defined by COLREGS and can be contacted on VHF 16 for further information as required reference proximity / nearby operations etc.

The east wave buoy previously located at position: 54 58.3147N x 002 22.6093E has now drifted outside the SOWF site boundary.

As per 14/01/2026, the this adrift wave buoy was located approx 45 nm SE of the array with the latest position being reported as 54° 28.314'N x 003°25.5170'E.

A remedy plans is being organised for the recovery and reinstatment of this wave buoy. 

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.

Mariners are advised that from 16/01/26 to 28/02/26, Fugro jack-up barge (JUB) “WaveWalker 1” will be performing nearshore geotechnical borehole investigations. This will be conducted on behalf of the client Scottish & Southern Electricity Networks Transmission (SSENT).

“WaveWalker 1” will be towed between sites and supported throughout by anchor handling

tug/utility vessel “Dutch Power”.

Work sites for “WaveWalker 1” are at Rattray Head (north of Peterhead) and Sinclair’s Bay (Caithness). A decision on which site will be sequenced first is to be made during tow.

At each site three (3) number boreholes will be drilled in order to assess geological conditions. Approximate borehole locations are between 400m and 1,200m from shore.

A 500m exclusion zone will be enforced around the JUB at all times. Vessels are to take caution when navigating in this area and pass well clear of the JUB.

Earliest start (either site) is 28th of February 2026. Precise date dependent on progress of tow which is weather sensitive. This notice may be updated when the worksite sequence is known and / or arrival date better defined. Following completion of operations at first site, the JUB will be towed to the second.

Partrac Ltd., on behalf of Jan De Nul and Southern Electricity Networks (SSEN), deployed a metocean seabed frame mooring at three landfall sites for an interconnector cable project between NW Skye and South Uist. The seabed frame sites are located in Holmar Bay (Uist), Ardmore Bay (Skye) and Meanish Pier in Loch Pooltiel (Skye), and each frame is deployed for 30 days. Partrac is planning to recover the frames from 21/01/2026 over two days, weather permitting, using the vessel Alyssa.  During recovery activities, the vessel will be restricted in their ability to manoeuvre and will display the appropriate lights and shapes prescribed by the International Regulations for Preventing Collisions at Sea. Other vessels are requested to provide a minimum clearance of 50m from the installation vessel during operations, and post-installation, and to pass at a safe speed.

Construction Support Activities  

The Service Operations Vessel (SOV) IWS Sunwalker will carry out construction support activities at the Offshore Substation Platform in the DBC construction site and at various WTG locations.

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 North Sea Enabler will conduct trenching operations on surface laid Inter Array Cables (IAC). The Service Operations Vessel Norside Cetus will conduct IAC termination and testing operations at various locations in the construction area. 

During operations, the North Sea Enabler 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.

SLB will be conducted between KP4.0 – KP148.0, Inspection operations will be performed at third-party asset locations where applicable. 

During operations, NKT Victoria will have restricted manoeuvrability as defined under COLREGs (International Regulations for Preventing Collisions at Sea, 1972). The vessel will display appropriate day shapes and lights and will transmit an Automatic Identification System (AIS) message.‘NKT Victoria’ will monitor VHF Channel 16 and VHF DSC Channel 70 continuously throughout the operation.

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

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

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

NOTE: Wave rider buoy has been reported as UNLIT.

See detailed map on our bulletin website

Construction Support Activities

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

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

The development of the windfarm is made up of several elements - current ongoing elements include:

Construction Support Activities

The Offshore Construction Support Vessels Boreas Enabler, IWS Skywalker, IWS Starwalker, Grampian Derwent and Grampian Tyne  will continue with ongoing 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.

On behalf of Inch Cape Offshore Ltd, Jan de Nul has completed rock placement operations within the Inch Cape site boundary and export cable corridor.

Subsea rock installation was conducted at the Offshore Sub Station platform and export cable crossing location. A flexible fall pipe system was used to place rock on the seabed at the two locations shown below in the attached notice to mariners. 

The rock installation vessel, Simon Stevin arrived at Inch Cape on 27/10/2025 and the works were completed in 3 days.

The campaign will commence on the 20th of January 2026 and continue until approximately 20th of February  2026. 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 North Sea Enabler 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.

All works will be continuous, 24 hours a day. Charts of the DBC array area are provided below.

During operations, NORSIDE CETUS 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.

3x Gearboxes and 3x Generators 

Jack up Location    IGG09    Gear Box   51°53.266’N    001°55.606’E

Jack up Location    GAD04    Generator    51°46.956’N    001°58.546’E

Jack up Location    IGH05    Generator    51°56.081’N    001°58.133’E

Jack up Location    IGF01    Generator    51°56.748’N    001°57.005’E

Jack up Location    IGJ06    Gear Box    51°53.825’N    001°58.259’E

Jack up Location    IGL01    Gear Box    51°53.784’N    001°59.783’E

Jack up Location    GAD03  Gear Box   51°47.365’N    001°59.117’E

Jack up Location    GAF01  Main bearing   51°47.173’N    001°59.910’E

Jack up delayed due to weather, latest information suggests itll arrive around the 14th 

Additionally this campaign is part of P20, P21 is due to commence in March 2026 so weather dependant these may run back to back with a port call inbetween to load out. a seperate notice and NTM will be created/sent out for P21

Details:

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

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

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

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

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

• The 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.

Survey works will include a single towed sensor and vessel mounted sonar. This survey requirements plays a critical role in ensuring the ongoing maintenance and integrity of UK energy infrastructure. Mariners are advised to always maintain a safe distance of at least 500m from the survey vessel location.

The marine survey activities are scheduled to commence on 12.01.2026 with completion by 25.01.2026.

Vessel NRH Katabatic will be optimised for this survey and will be working on 12-hour basis from Liverpool Port. The vessel will display the appropriate day shapes and lights and will transmit an Automatic Identification System (AIS) message and navigate in accordance with COLREG (International Regulations for Preventing Collisions at Sea, 1972).

 The vessel will sail line parallel to the cable route and survey corridor and shall maintain a constant heading whilst survey sensors are under tow. The vessel will ensure a constant forward motion is maintained.

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 Northern Victoria and JU Wind vessels. 

Scheduled vessel dates are as follows...

Glomar worker mobilise on 14/09/25 - completing 10/01/26 

Northern Victoria mobilise on 09/01/26 - completing mid Feb 26 

Tor Boreas dive support vessel mobilising on 20/09 - completing 19/01/26

JU Wind dive support mobilising on 19/01/26 - completing mid Feb 26

TheNortthern Victoria will identify targets in the OWF & ECR and Ju Wind will identify targets nearer to shore in ECR

Please be aware that, during the major repair activities, by virtue of its mode of operation the Jack-up vessel will be Restricted in her Ability to Manoeuvre (RAM) as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972, Rule 3). Masters of vessels are therefore requested to maintain their vessels and gears at a minimum safe passing distance from the vessel of 500 metres when it is undertaking work and showing the appropriate shapes and lights in accordance with COLREGs Rule 27. In order to not compromise the safety of the Deme Apollo and their crew, and the ability to undertake its contracted works, fishermen who have static fishing gears deployed within 500 m from the WTG where major repairs are planned (see Table 1 and Figure 1) are requested to provide the coordinates of such deployed gears in DMS and details of whether the surface markers used are visible at all states of visibility to Alex Winrow-Griffin (Brown & May Marine) using the contact information below (Section 58 of the Merchant Shipping Act 1995).Fishermen who have static gears deployed beyond 12 nm are reminded that static gear must be marked in accordance with Commission Implementing Regulation (EU) No.404/2011 (https://www.gov.uk/guidance/marking-of-fishing-gear-retrieval-and-notification-oflostgear#marking-of-fishing-gear). The Scottish Ministers have authorised the establishment of a 500-metre radius safety zone around all major maintenance works being undertaken. The safety zones will be active when the jack-up vessel involved in undertaking major maintenance works is attached to, or anchored next to, the renewable energy installation. No more than one 500 metre major maintenance safety zone will be active at any given time. All mariners are requested to give a wide berth to all vessels involved in the major repair activities.

Mariners are advised that a geophysical survey is planned for the Eastern Green Link 5 (EGL 5) project. The marine survey activities for EGL 5 are planned to commence on the 12th of January 2026 and are expected to complete approximately end of February 2026.

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

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

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

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

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

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

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

On behalf of Inch Cape Offshore Ltd, Enshore shall continue burial of export cable sections 1,2 & 3 from Cockenzie, East Lothian to the Inch Cape offshore substation.

The trenching vessel, CMOS Installer shall utilise a jetting burial tool and a remotely operated vehicle (ROV) to bury the cable. Cable burial operations are expected to continue until February 2026.

All seven rock bags placed on the seabed at the Cockenzie cable landfall site have been recovered from their locations as shown in fig 2.

On behalf of Inch Cape Offshore Ltd, the Offshore Energy Group Ltd. has serviced and redeployed five 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.

Lost acoustic monitor devices

Please note that during the servicing works, two acoustic moorings were lost during recovery at the original location of the initial deployment in August 2025, it is unlikely this equipment will be retrieved. Coordinates for the lost equipment are noted below.

The following table highlights WTG installation progress and next 7 day forecast.

Vessels operational during these works are as follows:

The exact finish date will be dependent on the prevailing weather conditions and work progress. Mariners are requested to remain where possible 500m from Construction vessels when exhibiting the day shapes / night lights for vessels restricted in their manoeuvrability.

Service Operation Vessels

The Service Operations Vessels (SOV) “Rem Power” & Daughter craft “Rem Transporter” continues to support to the SOWF project throughout the construction of the offshore windfarm.

The SOV 'ACTA Centaurus' and 'Austri Enable continues operations within the Sofia Array.

SOVs shall be transiting to / from the Sofia Array and the port of Blyth / Sunderland throughout this period.

Crew Transfer Vessel

The Crew Transfer Vessel (CTV) MHO Balder continues operations at the Sofia OWF.

All vessels can be contacted on VHF 16 throughout as required. All vessels shall be operating to / from the Port of Hull and will be operational 24 hours / day.

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

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

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.

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

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.

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

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

The table below provides a summary of each Cardinal and Special Mark Buoy deployed at the SOWF array, including target coordinates in WGS84 Degrees Decimal Minutes and a description of top mark and lantern characteristics. The Demarcation Buoys will be deployed for a period of approximately three years.  

The table below provides a summary of the Met-ocean Buoys deployed at the SOWF Array.

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

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 31st of January 2026, subject to weather.

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

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

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 31st of January 2026, subject to weather.

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

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

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 to January 2026.

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

Service of 12 and recovery of 5 Passive Acoustic Monitoring (PAM) Stations that have been deployed on the seabed in and at locations around the East Anglia THREE Offshore Windfarm Area.

The PAM stations will remain on the seabed until approximately the 31st of October 2027. The current PAM stations have 12 m height above the seabed, weighing up to 600 kg and their location is not marked by a surface buoy. There will, however, be three new moorings deployed with large buoys at the surface and anchored to the seabed by two 2 tonne anchor mooring weights

Cable laying operations will be conducted within the East Anglia THREE Offshore Windfarm by CLV Seaway Aimery. The vessel will install subsea cables between WTGs and the Offshore Converter Station (OFCS). During cable deployment, the vessel will be restricted in its ability to manoeuvre.The Seaway Aimery will carry out cable laying activities, and be supported by the Seaway Moxie, which will undertake equipment and personnel transfers to WTGs and the OFCS via a Walk to Work (W2W) gangway system. While conducting these transfers, the Seaway Moxie will also be severely restricted in manoeuvrability.

For further information regarding Inter Array Cable Installation Operations, please see attached East Anglia THREE Notice To Mariners 083-2025 Inter- Array Cable Installation.

Galloper Windfarm Bathymetric Survey on four locations / array cables between OSP and 4 x WTG locations by Survey Vessel Northern Storm commencing 28th December

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

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

Monopile installation is expected to continue until May 2026.

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

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

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

Survey Activities: XOCEAN is planning the collection of geophysical data using remotely piloted Uncrewed Surface Vessels (USVs) along a proposed cable route corridor in Orkney, from Holm to Burray within the Scapa Flow. The USVs are expected to operate out of Burray for the full length of survey. A mix of USVs with both hull mounted survey sensors (Multibeam Echosounders & Sub-Bottom Profilers) and also towed sensors (SideScan Sonar & Magnetometer) through the water in proximity of the seabed will be used. A crewed Support Vessel will be chartered throughout the survey to support the USVs with departures and arrivals from Burray Boatyard and assist in towing them back in if a technical issue occurs.

Dates/Duration: Operations are expected to commence 13 December 2025. It is expected that the survey activities shall be completed within 4-6 weeks (subject to weather).

Survey Area: Figure 1 below indicates the operational area which is shown by the red boundary. This is outlined in Table 1 below also.Fishing Gear Clearance: No fishing gear clearance is presently being requested for these surveys.

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. The second round of programmed works will commence at Arnish from 1 January, 2026.

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

Works to be carried out outside of channel but a split hopper barge will be operating between the Dredge site (Marchwood ERF SWintake) and the Nab spoil ground once per day. Divers will be in the water periodically throughout the duration of the dredging soreduced wash in the vicinity should be in place

See detailed map on our bulletin website

More details in the attached notice to mariners.

See detailed map on our bulletin website

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

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

During operations, the ‘JB 120’, ‘CENTAURUS’ (Lead tug), ‘FAIRPLAY 62’ (Assistant tug) and ‘FAIRPLAY 32’ (Assistant tug) will be restricted in their ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessels will also transmit an Automatic Identification System (AIS) message.

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

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

Echosounder and clump weight

A seabed mounted frame (1.6 x 1.6 m x 0.8 m, 350 kg) with echosounder inside was deployed in approx. 91 m water depth on 19th July 2024. The frame was connected with a ground line to a mooring weight/anchor (2,000 kg), which was attached to a standard spherical blue surface marker buoy with a riser to mark its position. The surface marker buoy was not visible at time of the first recovery attempt in January 2025 so is thought to have broken free from the clump weight. The frame was designed to be overtrawlable however the clump weight was not so could potentially pose a snag hazard. 

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

FLiDAR 1 anchor

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

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

The works will be performed in a single campaign, commencing on the 7th of December 2025 and continuing until approximately Q4 2026. The works will be continuous, 24 hours a day. The operations will include visual inspections and remedial maintenance at the Offshore Substation Platform (OSP) and at installed WTG foundation locations. During operations, the IWS Sun Walker will be restricted in its ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessel will also transmit an Automatic Identification System (AIS) message. It is requested that all vessels maintain a minimum of 500m separation distance from the SOV and pass at reduced speed. Fishing gear or other equipment with seabed intervention should not be deployed when approaching the working area.

THV Patricia has relocated the EA3 East 1 Buoy, EA3 East 2 Buoy, EA3 East Buoy 3 and the EA3 Special 3 Buoy marking the boundary of the East Anglia THREE Offshore Windfarm Array.

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

For futher information regarding East Anglia THREE aids to navigation, please see attached EA3 Notice To Mariners 080- 2025 - Aids To Navigation – Demarcation Buoys.

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

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

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

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

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

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

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

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

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

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

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

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

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)

See detailed map on our bulletin website

Crew Transfer Vessel NR Predator will provide assistance during the construction phase of the East Anglia THREE Offshore Windfarm Array and will make regular transits between East Anglia THREE CDM and the ports of Lowestoft and Great Yarmouth. 

Outer Thames Estuary Special Protection Area (SPA): 

As required under Deemed Marine License Condition 13(1)(c)(v) to minimise disturbance to red throated diver in the Outer Thames Estuary Special Protection Area (SPA) during construction of East Anglia THREE, these areas shall as far as practicable be avoided during transits from 01st November to 31st March. 

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

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

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

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

Outer Thames Estuary Special Protection Area (SPA):

As required under Deemed Marine License Condition 13(1)(c)(v) to minimise disturbance to red throated diver in the Outer Thames Estuary Special Protection Area (SPA) during construction of East Anglia THREE, these areas shall as far as practicable be avoided during transits from 01st November to 31st March.

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

Risk of cable exposure within the Rampion Wind Farm

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

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

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

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

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

Please review attached notice for further information on each item.

HS1 - Failed aviation lighting

HS1 & HS3 - No AIS Signal

HS2 & HS4 - Failed fog sounder

Some primary aims of the SubSea Soundscape project are;

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

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

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

Navigation Advice

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

Service of the 17 Passive Acoustic Monitoring (PAM) stations that have been deployed on the sea bed, in and at locations around the East Anglia THREE Offshore Windfarm Area.

There is an exclusion zone of 250m around each PAM station, all marine traffic is advised to abide by the 250m safety zone and navigate with caution at all times.

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

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

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

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

Main Bearing MAjor Component Exchanges on 5 x WTGs

See detailed map on our bulletin website

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

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

Crew Transfer Vessel NR Hunter will provide assistance during the construction phase of the East Anglia THREE Offshore Windfarm Array and will make regular transits between East Anglia THREE CDM and the ports of Lowestoft and Great Yarmouth. Outer Thames Estuary Special Protection Area (SPA): As required under Deemed Marine License Condition 13(1)(c)(v) to minimise disturbance to red throated diver in the Outer Thames Estuary Special Protection Area (SPA) during construction of East Anglia THREE, these areas shall as far as practicable be avoided during transits from 01st November to 31st March.

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

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

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

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

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

Transmission system operator Elia is building the Princess Elisabeth Island in the Belgian part of the North Sea. This artificial energy island is an extension of the electricity grid in the North Sea. It connects the future wind farms of the Princess Elisabeth Zone with the Belgian coast and creates new connections with neighbouring countries.

The energy island is built centrally in the Princess Elisabeth wind zone, approximately 45 km from the Belgian coast. Construction of the island will take several years. To ensure safety during the works, the Belgian government defined an exclusion zone within which only work vessels are allowed. This zone is marked by 4 cardinal buoys (ELI-N, ELI-E, ELI-S and ELI-W).

Seabed preparatory works took place in spring and summer 2024. The installation of the caissons started in April 2025 and will proceed untill autumn 2026. During the winter months, no installation works will take place. The exclusion area remains in force at all times.  

More information about the Princess Elisabeth Island is available on the Elia website: https://www.elia.be/en/infrastructure-and-projects/infrastructure-projects/princess-elisabeth-island. 

A total of 32 construction boundary demarcation buoys will remain in location until the windfarm construction activities have been completed and handed over to the Operations and Maintenance teams.

Once the permanent Aids to Navigation (AtoN) have been installed on the WTGs, Trinity House will approve the permanent AtoN and the boundary buoys will be removed.

If anyone finds a buoy that is off station or encounters a buoy location where it is not functioning or is missing, they should report this to the Dogger Bank Duty Marine Coordinator as soon as possible.

Norside Supporter Will be Bolting and Grouting 95 monopiles and transition pieces at the WTG locations set out in section 2.2 of this document. It is currently anticipated that weather permitting, offshore works will be carried out on a continuous basis (i.e. 24-hour working, seven days a week)

Positions for both North & South weather buoys are identified in the attached Notice To Mariners 005 -2025. There will be periodic maintenance for both weather buoys during construction of EA3.

There is an exclusion zone of 100m around the weather buoys, mariners are  advised to abide by the 100m safety zone and navigate with caution at all times.

Crew Transfer Vessel NR Rebellion will provide assistance during the construction phase of the East Anglia Three Offshore Windfarm Array and will make regular transits between East Anglia Three CDM and the ports of Lowestoft and Great Yarmouth. Outer Thames Estuary Special Protection Area (SPA) As required under Deemed Marine License Condition 13(1)(c)(v) to minimise disturbance to red throated diver in the Outer Thames Estuary Special Protection Area (SPA), during construction of EA3. It is anticipated that vessels which are transiting to Lowestoft and Great Yarmouth ports, such as for crew transfer operations, will transit through and/or in proximity to the Outer Thames Estuary SPA. These areas shall be as far as practicable be avoided during transit from 01st November to 31st March

Seaway Ventus will install 95 monopiles and transition pieces at the WTG locations set out in attached East Anglia Three Notice To Mariners 012 /2025. During the monopile and transition piece installation campaign, all vessels are requested to keep a 500m safety distance from the Seaway Ventus. It is currently anticipated that weather permitting, offshore works will be carried out on a continuous basis (i.e. 24-hour working, seven days a week)

During operations, the ‘Seaway Ventus’ will have restricted manoeuvrability as defined under COLREGS (International Regulations for Preventing Collisions At Sea, 1972). They will display the appropriate day shapes and lights and will transmit an Automatic Identification System (AIS) message.

The guard vessel ‘Tess’ will monitor vessel traffic in and around the East Anglia Three Offshore Windfarm 24hours a day, 7 days a week. The vessel will broadcast regular navigational warnings and will contact any non-project vessels they believe could cause potential hazards, risk of collision, or cause an interruption to project vessels or assets. She will be monitoring VHF Channel 16 and VHF DSC Channel 70 continuously throughout the operaton.

East Anglia THREE will be a large offshore wind farm, located 69 km off the Norfolk coast. With a projected capacity of approximately 1400MW, the wind farm shall supply electricity to approximately one million UK homes. Onshore construction for the project started in July 2022. 

By use of multiple specialized offshore vessels,1 Offshore Convertor station (OFCS) & 95 offshore wind turbine generators (WTGs) will be installed within the East Anglia Three site boundary along with the associated inter array and export cables. The generated power will be transmitted via an installed External Cable (EC) from the OFCS to a shore side substation located in Bramford.