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The survey equipment will consist of MBES, SSS, USBL, Mag, ROTV and UXO surrogate testing which will be placed on the seabed a maximum of three times in the nearshore area for equipment verification tests.

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. EGL3 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 3 UXO marine survey works are being carried out by GeoXYZ Limited.

The area of work, pertaining to this Notice to Mariners (NtM) for EGL 3, is highlighted in Figure 1, with the survey vessels contact details for the project found in Tables 1 & 2. Contact details for the project Fisheries Liaison Officers are detailed in the attachment.

Scottish Power Transmission (SPT) and National Grid Electricity Transmission (NGET) are working together to address the need for increased capacity within the transmission network between Scotland and England. EGL4 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 Fife and Lincolnshire. The EGL 4 UXO marine survey works are being carried out by Gardline Ltd. 

Update 10/08/2026:

The nearshore vessels Titan Discovery and Titan Endeavour will shift from 12-hour to 24-hour survey operations; the guard vessel Seiont-A will shift from 12-hour to 24-hour operations. No other material change to the work is planned to date.

  NtM Update 11/09/26: Additional offshore survey vessel: Ocean Geograph - See Table 1 below. Additional  Scout/Guard Vessel: GV Ability – See Table 2 below.

The survey equipment will consist of: Multibeam echosounder, side-scan sonar, USBL (ultra-short baseline acoustic positioning system), magnetometer array, and eBOSS (KP45-55 only).

Scottish Power Transmission (SPT) and National Grid Electricity Transmission (NGET) are working together to address the need for increased capacity within the transmission network between Scotland and England. EGL4 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 Fife and Lincolnshire.

The EGL 4 UXO marine survey works are being carried out by Gardline Ltd.

Please be advised that XOCEAN, on behalf of Bellrock Offshore Wind Farm Limited, are continuing ageophysical survey within a potential offshore cable export corridor associated theBellrock Offshore Wind Farm. The Geophysical Survey is estimated to take 60 days to complete (between9 August 2026 and 30 November 2026 allowing for weather and operational constraint).The GeophysicalSurvey commenced on 9 August 2026.

Please also be advised that INSPIRE, on behalf of Bellrock Offshore Wind Farm Limited, will be undertakinga benthic survey within the same potential offshore cable export corridor associated theBellrock Offshore Wind Farm. The Benthic Survey is estimated to take up to 25 days to complete (between14 September 2026 and 31 October 2026 allowing for weather and operational constraint).

Please be advised a Floating Offshore Wind Turbine (FOWT) will be towed from Sløvåg in Norway and installed in the Culzean Field.  The tow is expected to start on the 25th August and continue until 3rd September. 

Installation operations are expected to continue in the Culzean field until the end of September.

UPDATE: Tow Delayed (had to return to Norway), therefore date of notice extended to 11/10/26

Towing Route (Within UKCS waters):

·         Tow of the floating wind turbine from Sløvåg Norway to Culzean Field

Offshore Contacts: For Vessels involved with the project

Skandi Sandefjord – Towing / pre-lay vessel. Call Sign: LFXC IMO: 9470466

Tel:                          +47 9009 6739

V-Sat:                     +47 9009 6739

Iridium:                  +881 641 709 052

Inmarsat:              +870 773 941 650

E-Mail:   sandefjord.bridge@dof.com

Overview

The survey will be within the export cable route and wider seaweed management area. It should be noted that BBWFL are not requesting fishermen to relocate gear - on this occasion the vessel will work around any gear on location. The survey work is being undertaken by ABPmer and will be conducted from the Princess Royal.

Survey Duration  

The survey is planned to be undertaken within the period 28 September to 4 October 2026, subject to weather and operational constraints. Survey operations are expected to require up to three days within this period. BBWFL would like to extend this notices' validity to 31 October 2026 to account for any delay. BBWFL will send a further notice to confirm completion of the survey.  

Survey Tasks  

During the survey campaign, the vessel will deploy an underwater drop down video/camera to gather data on the extent and distribution of kelp.  No towed gear operations will be undertaken. The vessel will be generally unrestricted in its movements and will adhere to normal navigation protocol.  The survey area is defined by the following WGS84 coordinates in Table 1.  

For full details, please refer to the Notice to Mariners attachment to this notification. 

Service of the 12 Passive Acoustic Monitoring (PAM) Stations that have been deployed on the seabed in and at locations around the East Anglia THREE Offshore Windfarm Area, including the two PAM Stations with surface buoys.

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

Completion of servicing works and deployment positions will be notified via future Notice to Mariners.

There is an exclusion zone of 250 m around each PAM station, all marine traffic is advised to maintain the 250 m safety zone.

The Jack-up vessel Wind peak will carry out the replacement of the main bearings on two assets within the Beatrice Windfarm, these locations will be at WTG BE-K06 and WTG BE-L08.

This work will start on the 1st of Ocober 2026 and will be complete by the 20th of October.

All mariners and stakeholders are advised that a Passive Acoustic Monitoring (PAM) mooring array for the purpose of monitoring marine mammals’ detections is currently deployed along the east coast of Scotland, within 2 km of the coast, between St Andrews Bay and Inverbervie.The PAM array will remain in situ for 2 years (i.e. up to August 2027) with a service interval every 3 months. The moorings will not be surface marked as the top of the mooring extends approximately 4-7m above the seabed. A servicing campaign was completed on 11 September.

A separate mooring assembly remains in place at St Andrews Bay with a temporary surface marker buoy. This was deemed as a dropped object in previous NTM, as the marker buoy could no longer be located. This has been now confirmed to remain in place, to be recovered in the following days.

Mariners are requested to observe a safe working distance of 1000m when the Ramform Vanguard is performing towed survey activities at Awel y Môr Offshore Wind Farm. It is also requested that mariners observe a distance of at least 500m when Ramform Vanguard is manoeuvring into position for the safety of all sea users operating within the wind farm, and to ensure Ramform Vanguard can safely position itself without negative interactions with sea users or their equipment. The towed equipment extends approximately 350m behind the stern.

Construction Support Activities

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

Wind Turbine Generator (WTG) Installation

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

The ERRV Esvagt Castor will provide support for helicopter crew changes at the Dogger Bank OffshoreWindfarm 

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

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

Construction Support Activities

The Offshore Construction Support Vessels Norwind Helm, Grampian Tyne, Grampian Tweed, Windea Carnot, Windea Clarke, Grampian Derwent, Grampian Tay and Wind Lift 1 will continue with ongoing construction support activities within Dogger Bank A construction site.

Construction Support Activities

Inter-Array Cable Installation OperationsThe Service Operations Vessels (SOVs) Norside Cygnus and Wind Evolution will continue  inter-array cable installation operations, Flintstone will  conduct scour protection installation.

The Multi Purpose Offshore Vessel North Sea Enabler will continue the burial of surface laid Inter Array Cables (IAC).

The Survey Vessel Karina will conduct mulit-beam survey operations in the Inter Array Cable routes.

Please be aware that Global Marine has been commissioned to undertake an emergency repair on this cable in the North Atlantic between the Shetland and Orkney Islands using the CS Sovereign. 

The estimated repair location is 59° 49.0232'N, 02° 58.4468'W.

The repair vessel CS Sovereign is due to arrive on site on the 28th of August. The estimated duration of the repair will be 7-10 days depending on weather and other operational conditions. A further notification will be issued to all parties once the repair is complete. 

Please distribute this information accordingly so that other sea users are aware. The vessel will be limited in maneuverability and displaying shapes as per COLREGs. Other vessels should maintain a distance of at least 1NM from the cable ship during operations, and 1/4NM from any cable buoys in place during the course of the repair for safety.

Please contact Charlotte Hebden, GIS and Permitting Officer (charlotte.hebden@oceaniq.co.uk) or Samantha Moncur, Project Manager (samantha.moncur@globalmarine.group) if you require any further information or have any details of underwater operations in the vicinity of the repair site.

Scottish Power Transmission (SPT) and National Grid Electricity Transmission (NGET) are working together to address the need for increased capacity within the transmission network between Scotland and England. EGL4 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 Fife and Lincolnshire.

The EGL 4 UXO marine survey works are being carried out by Gardline Ltd.

Mariners are advised that a marine cable route survey is planned for the proposed Eday HVAC Subsea Cable. The survey will involve geophysical surveying. SSEN Transmission conduct marine surveys to gain information on seabed morphology, installation design, sediment structure and to gain benthic characterisation and habitat mapping. All the collected data provides the project with the best understanding on the marine environment to inform a Marine Environmental Assessment to be completed prior to cable installation.

SSEN Transmission plan to commence the marine survey on the 21/09/2026 however the earliest start date maybe 18/09/2026. The survey equipment will be deployed on a survey ROV and will consist of Multi Beam Echo Sounder (MBES), Side Scan Sonar (SSS), Sub-Bottom Profiler (SBP), Magnetometer, that will likely be no further inshore than 15m LAT. The survey equipment will also require calibration testing, which may be conducted outwith the survey corridor.The offshore survey works are being carried out by Reach Subsea UK Ltd. They are expected to be complete all survey works by end of October 2026, weather dependent.

General Safety AdviceThe vessel will be restricted in ability to manoeuvre at all times 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 500m from the survey vessels during marine operations and pass at a safe speed. Regular Security Messages will be issued on VHF Channel 16 and this Channel will be always monitored by the vessel. The vessels will also transmit regular Automatic Transmission Identification System (AIS) Messages.

All mariners and stakeholders are advised that there will be a planned outage of the Inch Cape Met Mast navigation lights and fog signals.

During maintenance works on the Inch Cape Met Mast there will be an outage of the navigation lights and fog signals from the 15th to the 17th of September 2026.

Met mast coordinates and location are shown in the attached Notice to Mariners

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

The PAM array will remain in situ for 2 years (i.e. up to August 2027) with a service interval every 3 months. The moorings will not be surface marked as the top of the mooring extends approximately 4-7m above the seabed. A servicing campaign was completed on 11 September.

A separate mooring assembly remains in place at St Andrews Bay with a temporary surface marker buoy. This was deemed as a dropped object in previous NTM, as the marker buoy could no longer be located. This has been now confirmed to remain in place, to be recovered in the following days.

Works involve towed equipment between a length of 100m and 250m behind the vessel and this will restrict the vessel’s ability to manoeuvre. It is requested that all vessels operating nearby maintain a safe distance (at least 500m) and pass at minimum speed.  All fishing activity should remain outside of the export cable corridor boundaries until further notice.  

Vessels will maintain a listening watch on VHF Channels 12 and 16 and will actively transmit an AIS signal. The vessel will comply with the International Rules for the Prevention of Collisions at Sea (COLREGS) at all times. Displaying the prescribed shapes and lights when the vessel is restricted in its ability to manoeuvre. 

Commissioning works are expected to be completed midddle to late October 2026.

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

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 Glomar Baltic is supporting the commissioning phase of the Offshore Converter Platform, providing close standby cover as required during overside works.

Service Operation Vessels

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

SOV's Acta Gemini' 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) Seazip 9 and MHO Gurli continue operations at the Sofia OWF.

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

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

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

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

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

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

The vessel will be operating 24 hours per day and operating from the Port of Ijmuiden & Great Yarmouth throughout this period. 

The vessel shall be monitoring VHF 16 with further vessel details included within the attached NtM. 

Five locations are identified within the Norfolk Vanguard East array site and five identified within the export cable route.  Those locations are presented below.

All vessels are advised to navigate with caution and keep clear of the provided positions by a 300m radius. 

Survey Activities: XOCEAN is planning the collection of geophysical data along a proposed cable route corridor in Orkney, from the islands of Sanday to North Ronaldsay. The vessel, Orca III, is expected to operate out of Westray for mobilisation and the North Ronaldsay area for survey activity. The vessel will pull towed sensors (SideScan Sonar & Magnetometer) through the water in proximity of the seabed.  

Dates/Duration: All survey operations are now complete. 

The Morecambe Offshore Wind Farm Development onshore export cable is planned to cross the River Ribble approximately 2 km west of Preston on its route from landfall near Blackpool Airport to the National Grid substation at Penwortham.

Please be advised that a geotechnical and geophysical survey (to include an unexploded ordinance (UXO) identification survey) is due to be undertaken.

The geophysical and geotechnical survey will be undertaken across the River Ribble cable crossing site to provide an overview of ground conditions near surface and at depth across the site (Figure 1). Geophysical surveys will be also conducted to search for any UXO to reduce the risk of encountering UXO during geotechnical investigations.

The survey will consist of a Phase 1 overwater Geophysical survey 16th/17th through to 21st September 2026, which will include a multibeam echosounder bathymetric survey, high resolution dual frequency side scan sonar, high resolution magnetometer survey and ET 3400 OTS Lite sub-bottom profiler (SBP). These works will be conducted from the “Validus”, a 7m Aluminium Catamaran.

The results of these surveys will be used to support the acquisition of 2x ~55m Geotechnical boreholes.Phase 2, once we have ensured the risk of UXOs is as low as reasonably practicable, an over-water intrusive ground investigation will be undertaken from a Jack-up platform (either the “Shearwater” or the “Sandpiper”) to obtain geological, geotechnical and geoenvironmental in-formation required for engineering design. This will be done through the delivery of two Geotechnical boreholes during the month of October 2026.

The following testing will be undertaken: -

Soil Testing•Standard Penetration Tests (SPTs);•Permeability testing;•Thermal resistivity testing.

Rock Testing•Point Load Strength Testing;•Modulus of Deformation testing;•Double Packer permeability testing;•Any associated borehole rock characterization

Laboratory testing•Recovered samples shall be subjected to laboratory testing for geotechnical and geoenvironmental purposes.The jack-up platform will operate on a 24hr basis while the vessel Validus will operate on a 12hr basis. All vessels will display appropriate day shapes (mast head signals visually indicating the status of a vessel to other vessels on navigable waters during daylight hours) and lights at all times during operations.

Table 1: Survey Area Coordinates.

Point Latitude (WGS84) Longitude (WGS84)1       53°45’17.29”          2°46’26.28”2       53°45’18.38”          2°46’16.86”3       53°45’14.05”          2°46’24.57”4       53°45’15.03”          2°46’15.03”

Table 2: Indicative Borehole Locations.

Point Latitude (WGS84) Longitude (WGS84)1       53°45’17.66”         2°46’18.51”2       53°45’14.56”         2°46’22.53”

Please see the attached Notice to Mariners for full details

The survey will be conducted by the survey vessel Ramform Vanguard” (Callsign: C6JF5).

As the survey vessel will be restricted in its ability to manoeuvre when surveying, due to the deployment of the towed survey equipment from the vessel for the duration of the survey activities, other vessels are kindly requested to keep a wide berth. The vessel will display appropriate lights and signals.

XOCEAN USVs and Support Vessel are shown in the attached notice, along with contact information for the vessels, as well as the Fisheries Liaison Team. The USVs are expected to operate out of Oban for the full survey duration. The survey will commence with USVs with hull mounted survey Multibeam Echosounders and Sub Bottom Profiler’s (SBP), as well as a towed Sidescan Sonar (SSS) and Magnetometer. A crewed Support Vessel will be chartered throughout the survey to support the USVs with departures and arrivals from Ardentallen and assist in towing them back in if a technical issue occurs.

The survey equipment will consist of MBES, SSS, USBL, Mag, ROTV and UXO surrogate which will be placed on the seabed a maximum of three times in the nearshore area for equipment verification tests.  

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. EGL3 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 3 UXO marine survey works are being carried out by GeoXYZ Limited.

PROJECT OVERVIEW Please be advised that Socotec Land & Hydrographic Surveys (on behalf of SHEPD) will be undertaking subsea inspections across the Forth Tay & Moray Marine areas. Please refer to Figure 1 - Figure 2 that highlights each cable location. Given the different conditions and water depths anticipated at each site, a range of vessels will be available for the project, detailed overleaf. The inspection works will be centred on a 50m cable corridor, defined by the start and end coordinates listed in Table 1.  

Geophysical surveys at Moray East Wind Farm  Please be advised that Moray Offshore Windfarm (East) Limited (Moray East) are planning to undertake a geophysical survey around 8 WTGs (K16, K17, G21, L09, C15, D13, G18, C13). Survey operations will be carried out by the Unmanned Surface Vessel: X-17 (vessel specs in Table 2), which is expected to arrive at site on 10/09/2026, subject to weather. The X-17 will be escorted by a support vessel, the Seacat (vessel specs in Table 3) 

The geophysical survey scope is a Multibeam Echosounder (MBES) survey, completing a 400m x 400m box around the WTGs (locations below in Table 1). 

General Safety Advice 

Please be aware that, during the survey activities, by virtue of its mode of operation the vessel X-17 (Unmanned Surface Vessel) will be Restricted in her Ability to Manoeuvre (RAM) as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972, Rule 3). Masters of vessels are therefore requested to maintain their vessels and gears at a minimum safe passing distance from the vessel of 500 metres when it is undertaking work and showing the appropriate shapes and lights in accordance with COLREGs Rule 27.  

In order to not compromise the safety of the Survey Vessel, their crew, and their ability to undertake its contracted works, fishermen who have static fishing gears deployed within 500 m from the WTG where survey activities are planned (see Table 1) are requested to provide the coordinates of such deployed gears in DMS and details of whether the surface markers used are visible at all states of visibility to Alex Winrow-Griffin (Brown & May Marine) using the contact information below (Section 58 of the Merchant Shipping Act 1995). 

Fishermen who have static gears deployed beyond 12 nm are reminded that static gear must be marked in accordance Commission Implementing Regulation (EU) No. 404/2011 (https://www.gov.uk/guidance/marking-of-fishing-gear-retrieval-and-notification-of-lost-gear#marking-offishing-gear)  

The purpose of the NO-UK survey is to assess the cable alignment of the recent installed cable system and establish the indicative burial depth along the entire route from the UK – Norway. The survey will be conducted by the VOS GORGEOUS.  The survey will consist of geophysical techniques only with the use of an EdgeTech Buried Object Sonar System (eBOSS), integrated with a Multibeam Echosounder (MBES).

The survey works shall be conducted in the offshore section by the Fugro Frontier utilising multibeam echosounder, towed sidescan sonar, SBP and towed eBOSS sub-bottom imager, and in the nearshore section by the Fugro Seeker and MJM Enterprise.

This notice to mariners concerns the operation of the Fugro Frontier.

The survey will involve the full coverage of dedicated survey lines with a geophysical survey system multibeam echo sounder, towed Sidescan Sonar, SBP and towed eBOSS.

Other vessels are requested to maintain an appropriate and safe distance of 500m when passing the Fugro Frontier.

Schedule of Operations:

Fugro Frontier – Operations 12th Sept to the 30th September (Estimate)

GAC07 Blade Bearing

GAD05 Blade Bearing

IGE13 Blade Bearing

IGE08 Transformer

GAC01 Generator

Daniel Bernoulli will start operations on 30th of Auhust 2026 and will perform rock placement during multiple loadouts, finishing her scope around 10th of October 2026. Work will be continuous, 24 hours a day.

During operations, Daniel Bernoulli 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 Flintstone and pass at reduced speed.

See detailed map on our bulletin website

Re-surveyed March 26

A survey has identified potential cable exposures at several locations beyond the commonplace exposures (within the 50m radius around wind turbine and offshore substation foundations). The position and extent of the cable exposures shown in the below chart is limited to the burial status observed at the time of the survey.  Cable burial status evolves over time, often rapidly. Mariners should not assume otherwise.  Cable burial status is monitored periodically, and further information will be provided following future survey campaigns. Ørsted advises mariners to maintain care when operating within the windfarm array area.

Please be aware, two of the five fog horns on the assets at the Kincardine wind farm are inoperable at the present time (Kin-04 and Kin-05). Seafarers are asked to take care when navigating the area in poor visibility.

The current phase of cable burial and protection works in Irish waters is complete for 2026. As a result, the majority of the route is now being re-opened to fishing activities. However, two defined offshore areas will remain temporarily closed until the cable burial and protection is complete, currently expected in 2027.

The two defined areas that will continue to remain temporarily closed to fishing activities are shown with the below coordinates. The two areas include a temporary closure of +/- 1000m either side of cable route. All other areas are re-opened to fishing activities.

Guard vessels

• Two guard vessels remain on site along the temporary closed areas in Irish waters.
• A third guard vessel is available to provide additional support if operationally required.
• The guard vessels will continue to provide daily safety broadcasts and further operational information to passing vessels.
• The vessels will keep a listening watch on channel 16 and transmit an AIS signal

The updated guard vessel (GV) list is shown below:

1. GV Lapwing
2. GV Star of Hope
3. GV Accord (standby)

The position of the vessels will be subject to rotation of the vessels and associated locations. 

As part of the marine operational works in Irish waters, subsea rock installation has been used to protect sections of the cable route. Further information on the locations of the subsea rock installation along the route will be made available soon.

There are no further operations planned in Irish waters this year for the Celtic Interconnector project, further information on 2027 operations will provided as they become available.

See detailed map on our bulletin website

Survey Activities: XOCEAN is planning the collection of geophysical data using remotely piloted Uncrewed Surface Vessels (USVs) along the cable route between Ardmore-Skye and Flodabay-Harris. The USVs are expected to operate out of Tarbert for the full survey duration. A mix of USVs with both hull mounted survey sensors (Multibeam Echosounders & Sub-Bottom Profilers) and also towed sensors (SideScan Sonar & Magnetometer) through the water in proximity of the seabed will be used. In addition a crewed survey vessel will be engaged in the survey operations consisting of both Multibeam Echo Sounders and towed sidescan and magnetometer.  

A crewed Support Vessel will be chartered throughout the survey to support the USVs with departures and arrivals from Tarbert and assist in towing them back in if a technical issue occurs. 

Dates/Duration: Operations are now due to re-commence on 09h September 2026, brought forward from the previously stated date of 14th September 2026. It is expected that the survey activities shall run for approximately 14 days, subject to weather.  

Survey Area: Figure 1 below indicates the operational area including a 500m buffer from the survey corridor. Coordinates delineating the area are in Table 1 below also.  If mariners believe our operations will interact with their activities then they should get in touch via the FIR/ FLO. 

Legal Notice: Please be advised that this Notice to Mariners should be treated as official notice of the nature, duration and location of the works which are scheduled to take place. During the period of this notice, we request that you plan your activities around our short-term, temporary activities. Any failure to remove equipment where this has been requested, or entry into the identified location in a manner that would constitute a hazard may be a breach of your duties of safe seamanship as described in the Convention on International Regulations for Preventing Collisions at Sea 1972 and/or the Merchant Shipping Act 1995, and may result in removal of the relevant equipment. Failure to remove equipment, where this has been requested, or entry into the identified location in a manner that would constitute a hazard may constitute a breach of duty of care at common law, and a failure to protect submarine cables for successful seabed user co-existence under Scotland's National Marine Plan. SHEPD shall found on this notice in the event of any damage, loss or disruption arising from failure to heed the information herein.

All mariners and stakeholders are advised that annual maintenance will be carried out on the Inch Cape development construction phase demarcation buoyage.

The utility vessel FCS Vega will recover the buoys, complete the maintenance schedule and redeploy them in the coordinates shown below in fig 1 and table 1.

FCS Vega is expected to commence the maintenance on or around the 8th of September 2026 with operations expected to be complete within 7 days. Vessel details shown in section 4

The survey equipment will consist of MBES, SSS, USBL, Mag, ROTV and UXO surrogate testing which will be placed on the seabed a maximum of three times in the nearshore area for equipment verification tests.

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. EGL3 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 3 UXO marine survey works are being carried out by GeoXYZ Limited.

The area of work, pertaining to this Notice to Mariners (NtM) for EGL 3, is highlighted in Figure 1, with the survey vessels contact details for the project found in Tables 1 & 2. Contact details for the project Fisheries Liaison Officers are detailed in the attachment.

A support vessel will escort the USV from the harbour entrance until open water. The USV will then continue transiting towards the survey site. It is requested that other vessels remain clear, so far as is practicable, during transit & survey operations. Although the vessels are unmanned, it is crewed throughout the 24-hour operation, piloted remotely using 360-degree cameras and other navigational aids

The only means of direct VHF communications with the vessels is on VHF Channel 16 Project vessels are advised to contact Seagreen Marine Control on VHF private channel P1 when entering or traversing within the windfarm.

All mariners are advised to keep a safe clearance distance of no less than 500m from the USVs and inspected Asset. 

Please be advised that Socotec Land & Hydrographic Surveys (on behalf of SHEPD) will be undertaking subsea inspections across the Argyll & Bute Marine area. Please refer to Figure 1 - Figure 5 that highlights each cable location.  Given the different conditions and water depths anticipated at each site, a range of vessels will be available for the project, detailed overleaf.  The inspection works will be centred on a 50m cable corridor, defined by the start and end coordinates listed in Table 1. 

Survey Activities: XOCEAN is planning the collection of geophysical data along a proposed cable route corridor in Orkney, from the islands of Sanday to North Ronaldsay. The vessel, Orca III, is expected to operate out of Westray for mobilisation and the North Ronaldsay area for survey activity. The vessel will pull towed sensors (SideScan Sonar & Magnetometer) through the water in proximity of the seabed.  Dates/Duration: Operations commenced on 14 July 2026. It is expected that the survey activities shall be completed by 20th September 2026 (subject to weather). Survey Area: Figure 1 below indicates the operational area in red. This is outlined in Table 1 below also.  

Activity:

Operation of remotely piloted Uncrewed Surface Vessels (USVs) are planned in the Dutch North Sea sector, during September to October 2026. The vessels will be engaged in survey activities within the following offshore windfarms (OWF’s).

In addition to survey operations within the OWF array areas outlined above, survey activities will also be conducted along the export cable route (ECR) connecting Eneco Luchterduinen OWF to the Dutch coastline, as detailed below.

Duration:

Survey operations are expected to commence from 11th September 2026 for approximately 6 weeks, subject to weather and other operational factors.

Location:

In addition to the survey areas outlined above, the USVs will transit from/to the prots of Ijmuiden, Netherlands and Neeltje Jans, Netherlands.

Mode of Operation:

Although the USV are uncrewed, they are managed throughout the 24 hour operation, piloted remotely using 360 degree cameras and other navigational aids. The USV sends real time images and situational awareness data over satellite to a team of operators keeping watch and controlling the vessel remotely 24/7. A support vessel will escort the USV from the active ports to clear water. Seafarers are asked to avoid contact with the vessel and be aware of the operational area during this period. 

Safety Precautions: The USV is equipped with the following to make it conspicuous to other marine traffic:

• AIS
• Navigation Lights & Sound Signal
• Active Radar Reflector
• Superstructure Painted Yellow
• VHF

Activity:

Operation of remotely piloted Uncrewed Surface Vessels (USVs) are planned in the UK and Danish North Sea sectors, from mid-May 2026. The vessels will be engaged in survey activities between Hunmanby Gap, UK and Henne Strand, Denmark on behalf of Woodstock Cable Limited.

Dates & Duration:

Survey operations are expected to commence from 13th May 2026 for approximately 4 months, subject to weather and other operational factors.

 Location:

The survey area comprises an approximate 300m wide survey corridor between Hunmanby Gap, UK and Henne Strand, Denmark. The USV is expected to be operating within +/- 150m of the centreline route. In addition to the survey area, the USVs will transit from/to the ports of Scarborough, UK, Esbjerg, Denmark & Hvide Sande, Denmark.

Vessels:

It is expected there will be up to six USV operational at any one time. Vessels will be a combination of XOCEAN’s XO-450 & XO-580 class USV’s. 

Mode of Operation:

Although the USV are uncrewed, they are managed throughout the 24 hour operation, piloted remotely using 360 degree cameras and other navigational aids. The USV sends real time images and situational awareness data over satellite to a team of operators keeping watch and controlling the vessel remotely 24/7. A support vessel will escort the USV from the active ports to clear water. Seafarers are asked to avoid contact with the vessel and be aware of the operational area during this period. 

Safety Precautions: The USV is equipped with the following to make it conspicuous to other marine traffic:

• AIS
• Navigation Lights & Sound Signal
• Active Radar Reflector
• Superstructure Painted Yellow
• VHF

Activity:

Mariners are advised that XOCEAN will be utilising the Geo Ranger to conduct geophysical & UXO survey activities in the UK and Danish North Sea sectors, from July 2026. The vessel will be engaged in survey activities between Hunmanby Gap, UK and Henne Strand, Denmark on behalf of Woodstock Cable Limited.

Survey Equipment:

The survey equipment will consist of multibeam echosounder (MBES), Sub-bottom profiler (SBP), sidecan sonar (SSS), ultrashort baseline acoustic positioning system (USBL) and magnetometer (MAG).

During survey operations, the vessel will be operating at approximately 4 to 5 knots with equipment being towed approximately 200m astern. 

Dates & Duration:

Survey operations are expected to commence from 24th July for approximately 5 weeks, subject to weather and other operational factors.

Location:

The survey area comprises an approximate 300m wide survey corridor between Hunmanby Gap, UK and Henne Strand, Denmark with survey extents between the UK terratorial waters boundary and the Danish 15m contour. The vessel is expected to be operating within +/- 150m of this route. In addition to the survey area, the vessel will transit from/to the below ports for weather shelter. Mobilisation/demobilisation will be from Ijmuiden, Netherlands.

• Ijmuiden, Netherlands
• Eemshaven, Netherlands
• Esbjerg, Denmark
• Blyth, UK
• Hull, UK
• Newcastle, UK

Vessel:

The workscope will be conducted from the Geo Ranger. Further details are provided in the Table below.

General Safety Advice

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. Seafarers are requested to provide a minimum clearance of 500m from the survey vessel during marine operations and pass at a safe speed. VHF Channel 16 will be monitored by the vessel at all times. The vessel will also transmit regular Automatic Transmission Identification System (AIS) Messages. The proposed works will be 24 hours a day.  

Fisheries Liaison:

Fisheries liaison representation is provided by Seagard whose contact details are provided below. A scout vessel will be utilised where it is deemed necessary.

Mariners are advised that Neart na Gaoithe Offshore Wind Farm Limited (NnGOWL) has completed the replacement and burial of the Orange-D inter-array cable (IAC). However, a short section of the Orange-D IAC remains below target burial depth and is identified as a seabed hazard.

Mariners are requested to avoid the area defined by the coordinates provided in Table 1. The site reopened to static fishing on the 1st September 2026.

Table 1 – Coordinates for the seabed hazard - exposed IAC (Orange-D)

Area of Operations

Mariners are advised that operation and maintenance vessels will be working within the boundaries of the Neart na Gaoithe Offshore Wind Farm,

All vessels are requested to remain at least 500 meters away from all the work vessels. Vessels over 15m are requested to have AIS turned on and detectable when in the vicinity of operation and maintenance works. Vessels are requested to contact the NnG Control Room prior to entering the site to confirm current safety zones in place, and to ensure that the NnG Control Room can be made aware of your presence on site.

Mariners are advised that Neart na Gaoithe Offshore Wind Farm Limited (NnGOWL) has completed the replacement and burial of the Orange-D inter-array cable (IAC). However, a short section of the Orange-D IAC remains below target burial depth and is identified as a seabed hazard.

Mariners are requested to avoid the area defined by the coordinates provided in Table 1. 

Table 1 – Coordinates for the seabed hazard - exposed IAC (Orange-D)

Mariners are advised that UXO (Unexploded Ordnance) and Archaeology marine geophysical surveys are planned for the Eastern Green Link 4 (EGL 4) project. The marine survey activities for EGL 4 are planned to commence in early September 2026 in Scottish nearshore and offshore waters and are expected to complete in October. The survey sensors will consist of: Multibeam echosounder, side-scan sonar, USBL (ultra-short baseline acoustic positioning system), magnetometer array, and sub-bottom profiler.

XOCEAN will undertake a geophysical inspection survey of approximately 127km of the Western Link HVDC cable system from the south of the Isle of Man to its landfall at the Wirral, England.

The survey will be completed using two XOCEAN Uncrewed Surface Vessels (USVs) equipped with Multibeam Echo Sounder (MBES) and towed Side Scan Sonar (SSS) systems.

The objective of the survey is to monitor cable burial status, seabed mobility, rock berms, concrete mattresses, cable crossings and associated seabed features identified during previous inspection campaigns

The location of the survey work is illustrated in a map in the Notice to Mariners, along with details of the two SUVs and their support vessels.

Mariners, particularly those operating small craft or deploying anchors, fishing gear, or other seabed contactequipment, are advised to exercise caution in the vicinity of the identified location due to thepotential snagging and anchoring risk and should avoid anchoring directly over the affected area.

Please be advised that Socotec Land & Hydrographic Surveys (on behalf of SHEPD) will be undertaking subsea inspections across the North Coast & Orkney marine areas. Please refer to Figure 1 - Figure 2 that highlights each cable location. Given the different conditions and water depths anticipated at each site, a range of vessels will be available for the project, detailed overleaf. The inspection works will be centred on a 50m cable corridor, defined by the start and end coordinates listed in Table 1. 

Please be advised that Socotec Land & Hydrographic Surveys (on behalf of SHEPD) will be undertaking subsea inspections across the West Highland marine areas. Please refer to Figure 1 - Figure 4 that highlights each cable location.  Given the different conditions and water depths anticipated at each site, a range of vessels will be available for the project, detailed overleaf.  The inspection works will be centred on a 50m cable corridor, defined by the start and end coordinates listed in Table 1. 

Please be advised that Socotec Land & Hydrographic Surveys (on behalf of SHEPD) will be undertaking subsea inspections across the Outer Hebrides marine areas. Please refer to Figure 1 - Figure 7 that highlights each cable location.  Given the different conditions and water depths anticipated at each site, a range of vessels will be available for the project, detailed overleaf.  The inspection works will be centred on a 50m cable corridor, defined by the start and end coordinates listed in Table 1. 

On behalf of Inch Cape Offshore Ltd, Seaway 7 shall commence the installation of WTG jacket foundation pin pile components. There will be three pin piles installed in the seabed at each of the 18 jacket locations throughout the Inch Cape Site.

The pin piles will be transported from the Port of Leith to the Inch Cape site and installed in the seabed using a pile installation frame, as shown in the attached Notice to Mariners

The installation vessel, Alfa Lift, is expected to arrive at the Inch Cape site on or around the 31st of August to commence installation activities which will continue for several weeks, further detail in the attached Notice to Mariners

There is an an intermediate peripheral structure within the Beatrice windfarm with a marine lantern that is unlit.

This structure (BE-D11) is on the Western boundry of the Beatrice windfarm.

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

Rock placement remedial works on C2 and C3 are expected to begin from 3rd September. Dates are subject to change due to weather or operational requirements.

Locations and timeframes of all activities are set out in the attached Notice to Mariners. 

The works, managed by Prysmian, will be carried out between 5th September 2026 to 15th October 2026 (weather dependent). 

Mariners are advised that these works will be taking place within areas already closed as part of the ongoing Identification and Clearance Works.  Vessels, when transiting, are requested to pass at a safe speed and distance of at least 0.5 nautical miles from the Works Area. During the ongoing works, the vessel will have restricted manoeuvrability as it completes the work scopes. VHF CH 16 will be monitored at all times and will be used to contact the coastguard in the event of an emergency.

The SOV Norside Cetus will mobilise from the port of Montrose circa 29th August 2026 for a period of what is expected to be two months.

The Norside Cetus will replace the Esvagt Brint as the site vessel.

Scottish Hydro Electric Power Distribution (SHEPD)

PH003762 Skye-Uist Replacement

Notice to Mariners

Please be advised that Jan De Nul Luxembourg S.A. has undertaken power cable installation and power cable protection activities for the Skye-Uist Replacement project. The project comprises two new subsea power cables: one between Loch Pooltiel on the Isle of Skye and Loch Carnan on the Isle of South Uist and the other one between Ardmore on Isle of Skye and Loch Pooltiel on Isle of Skye. 

This notice supersedes the earlier Notice to Mariners dated 21/08/2026. The cable installation and protection works described in the previous Notice have now been completed (except for the cable end in the Ardmore Bay, Isle of Skye). Initial cable lay was undertaken as surface lay, followed by the required cable protection and stabilisation works. An update of the vessels currently present is available in Table 2.

Please note that the cable at Ardmore Bay has been installed and not yet protected nor stabilised. The cable end was previously placed in wet storage on the seabed surface. Cable recovery and subsequent pull-in activities at Ardmore Bay will be undertaken at a later stage this year. These activities will be notified in due time through a forthcoming revision of this Notice to Mariners.

OEG has returned to the EA2 Windfarm Development Consent Order Limits with the Northern Victoria vessel and is carrying out the the following scopes:-

Explosive Ordnance Disposals (EOD)

There is a total of 3 confirmed UXO's remaining that are being disposed of using Low Order Deflagration techniques during August & September. No High Order disposals will be carried out. Security broadcasts are being made at requisite times ahead of disposal activities to all vessels in the area to keep clear of the UXO Disposal site.

Noise monitoring/hydrophone placements have now ceased and all noise monitoring devices have now been recovered and removed from site.  

Boulder Relocations

A total of approx 92 boulders are remaining for relocation during August & September. This is being carried out using an SMT. 

Out of Service Cable Removals

12 OoSCs are expected to be removed during September by use of WROV and SMT. 

This has been issued to update mariners on the upcoming major component exchange which will take place within the Moray Offshore Windfarm (West) Limited (Moray West) site. The start date for works has been delayed, and works are now to take place in September/ October 2026 and will last approximately 14 days (subject to weather).

The works comprise a transformer exchange which will be carried out at two locations: WTG EO8 and WTG L09 (Table 1). The works will be carried out utilising the jack-up vessel “Wind Peak” which will be required onsite for the duration of the works, with client reps in place throughout. There will be a ERRV (Emergency Response & Rescue Vessel) in the field 24 hours a day to provide cover for the JUV and an additional CTV for support. Details of these vessels will be updated once confirmed and communicated.

Reach Subsea UK LTD are conducting an offshore survey campaign on behalf of Scottish Hydro Electric Transmission Plc. Trading as Scottish and Southern Electricity Networks Transmission (SSENT). SSEN Transmission commenced the marine survey inside 12nm on 28th March 2026 with X-Ocean Nearshore works completed. The nearshore geophysical survey vessels (Unmanned Surface Vehicles (USVs) will be operating within 15m LAT and out to >30m LAT, working as close to shore as possible. The survey equipment will also require calibration testing, which may be conducted outside of the survey corridor. The Survey Vessel C-Trojan will be conducted by Reach Subsea UK Ltd mobilising 28th August 2026 and is estimated to be completed on the 30th September 2026.

Jack-up Vessel: Wind Server Has a length of 79.6m, breadth of 32.2m with a draft of 7.4m Equipment will be periodically deployed and suspended from the vessel crane during jack up operations. 

A 500m radius restricted zone will be in place, centred on the Wind Server at all times whilst onsite. If access is required into this zone for non-project vessel traffic, authorisation must be requested from the vessel master. 

The marine survey activities for Western Link 2 will commence on the 13/07/2026 and includes geotechnical, benthic, and geophysical survey work in the survey corridor, from the Firth of Clyde at the northern end, through the North Channel, into the Irish Sea, and landing at Caernarfon Bay at the southern end.

The offshore geotechnical work will be undertaken by survey vessel Geo Ocean VI and the nearshore geotechnical work will be undertaken by the jack-up barge Causeway Giant 1. The work will consist of a geotechnical survey to collect high-quality geotechnical data through seabed cone penetration and vibrocoring, and nearshore ground investigation work at borehole locations.

The offshore and nearshore benthic survey work will be undertaken by survey vessels, Roman Rebel and Seren Las, respectively, and will consist of grab sampling.

The offshore geophysical survey work will be undertaken by survey vessels Frontier, Seeker, and USV Blue Eclipse.

There will be two landfalls in Ayrshire, Scotland, and one landfall in Caernarfon Bay, Wales. 

Cable ‘laying operations will continue to be conducted within the East Anglia THREE Offshore Windfarm by CLV Seaway Phoenix.The vessels will install subsea cables between WTGs andthe Offshore Converter Station (OFCS). The Grand Canyon III will conduct trenching and burial operationssupporting the Cable-Laying operation. During cable deployment, trenching & burial all vessels involved willbe restricted in their ability to manoeuvre.The Seaway Phoenix will be supported by the Seaway Moxie,Norside Supporter & Windea Clausius, 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, Norside Supporter & Windea Clausius will also be restricted in manoeuvrability.The Rix Lion will be the CTV support vessel providing 24hr support covering both cable installation and T&T

The survey works shall be conducted in the nearshore section by the Fugro Seeker utilising multibeam echosounder, towed sidescan sonar SBP and USV, and by the MJM Enterprise using a GeoArm sub-bottom imager.

This notice to mariners concerns the operation of the Fugro Seeker and MJM Enterprise.

MJM Enterprise: The survey will involve the full coverage of dedicated survey lines with a pole mounted seabed imager in water depths from 2m LAT to 15m LAT

Other vessels are requested to maintain an appropriate and safe distance of 500m when passing the MJM Enterprise.

Fugro Seeker: The survey will involve the full coverage of dedicated survey lines with a geophysical survey system multibeam echo sounder, towed Sidescan Sonar, SBP and SubBottom Profiler in water depths from 0m LAT to 15m LAT

In the very nearshore section of the route at the Isle of Grain, 0m LAT to +3m LAT (drying) the Fugro Seeker will be operating a shallow draft USV to acquire MBES and SBP data.

51°27.3’N 000°43.7’E, 51° 27.7N 000° 44.7’E

The Survey USV will be operated from the Fugro Seeker. The Fugro Seeker will remain within 1500m and maintain line of sight to the USV during operations.

Other vessels are requested to maintain an appropriate and safe distance of 500m when passing the Fugro Seeker.

Please be advised that Galloper Windfarm will be carrying out a major component exchange from the Jack Up Vessel (JUV) WIND ENERGY on 5 locations in the north field.

Planned Dates: 7th June 2026 for approximately 2 months - subject to weather

An exclusion zone of 500m is required around the JUV

Culzean : Floating Offshore Wind Turbine (FOWT)

Installation operations will be taking place within the control area defined below and vessels are requested to avoid entering this area.

Offshore Contacts Culzean Field

Platform Central Control Room

Tel:          +44 1224 082004

VHF:       08 / 16

VOS Fantastic – EERV. IMO: 9647239

Tel:                          +45 8988 2389

Mob:                       +44 7833 050 669

Iridium:                  +881 677 108 029

E-Mail:   bridge@vosfantastic.fleetvroon.com

Please be advised that Socotec Land & Hydrographic Surveys (on behalf of SHEPD) will be undertaking subsea inspections across the Shetland Isles marine areas.

Please refer to Figure 1 - Figure 2 that highlights each cable location. 

Given the different conditions and water depths anticipated at each site, a range of vessels will be available for the project, detailed overleaf.

The inspection works will be centred on a 50m cable corridor, defined by the start and end coordinates listed in Table 1.  

Please be advised that Galloper Windfarm will be carrying out Paint repair campaign. The campaign will be using the Seacat Liberty across both North and South Galloper Fields.

 The vessel will be operating during the daytime only, 16 working days commencing 23rd of July 2026 – weather dependant.  

An Exclusion zone of 250 metres will be required whilst the work scope is underway.

The JUV will facilitate all lifting activities and main component exchanges at: 

â–ª A10 - Generator Replacementâ–ª E11 - Main Bearing Replacement.â–ª G05 - Main Bearing Replacement.â–ª Q13 - Main Bearing Replacement

A 500m clearance to the vessel and all fixed structure locations whilst working in this area is required, 

Mariners are advised that the Northern Wind will be conducting a full site survey using high resolution MBES (inc Backscatter).  The Cardinal P will be conducting a full site internal survey with the use of ROV.  A 500m clearance to the vessel and all fixed structure locations whilst working in the area is required.

The following vessels are operational 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.

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. 

 Mariners are advised to maintain a stand -off of 500m from the area stay until further notice.

•       The lost cone is not considered to pose a hazard to general navigation.

•       Based on the data at the time of loss and the length of lost equipment vs. the penetration into the seabed, it is believed that the lost rod will not likely be protruding from the seabed.

•       However, the lost cone may be a potential snagging risk for fishing gear, etc. Furthermore, they may present a risk to small vessels when anchoring or operating gear near the seabed in close proximity to the location detailed in the table below.

•       WL2 is in regular contact with the local Marine Management Organisation (MMO) coastal officers; a dropped object / lost gear form is in the process of being submitted to the MMO for the lost cone.

Mariners are advised of the completion of marine activities in relation to the Orkney HVAC, GVI & Mattress works.

The completion of the works includes the installation of several mattresses at the locations highlighted in  the attached NTM. These assets will facilitate  cable installation works in early 2027.

As such, until the final cable is installed, these assets pose a hazard to marine users. Mariners are therefore advised to maintain a stand-off of 500m from this asset until further notice.

Contact details for any queries can be found in NTM.

Activity Description:‘VOSTraveller’ will provide standby emergency response and rescue within the boundary of the East AngliaTHREE Offshore Windfarm Array. The ‘VOS Guardian’ will be the relief vessel to cover these duties when theprimary emergency response and rescue vessel ‘VOS Traveller’ conducts port calls for crew changes andresupplies.1.3. Program Schedule: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.Arrival and departure plan of the VOS Traveller & VOS Guardian will be notified via the East Anglia THREEWeekly Notice of Operations.Completion of the vessels work scope will be notified by closure of this Notice to Mariners

Mariners are advised of the completion of marine activities in relation to the Orkney HVAC, Dounreay HDD works, located in the near-shore area off Dounreay. 

The completion of the works includes the installation of two subsea HDD ducts and supporting rock bags. Thess assets will facilitate the cable installation works in early 2027.

As such, until the final cable is installed, these assets pose a hazard to marine users. Mariners are therefore advised to maintain a stand-off of 500m from this asset until further notice. Full details and coordinates are contained in attatched NTM.

The works, managed by Prysmian, will be carried out between the 7th August 2026 to 15th October 2026 (weather dependent). 

Vessels, when transiting, are requested to pass at a safe speed and distance of at least 0.5 nautical miles from the Works Area. During the ongoing works, the vessel will have restricted manoeuvrability as it completes the work scopes.  

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

The works, managed by Prysmian are expected to start on or around the 8th August 2026 and are expected to complete on or around the 30th December 2026 (weather dependent).

The first phase of the works will include exit pit and trench excavation, which is expected to take place between 8th August to 15th October 2026. The works will be carried out by Capall Mara (barge) and Manannan (crew transfer vessel).

Following this, HDD marine assistance works will be expected to take place between 15th September and 30th December 2026. This Notice to Mariners will be updated to include the vessels working on the next phase of work.

Vessels, when transiting, are requested to pass at a safe speed and distance, and fishing vessels are advised to remain at a safe distance of at least 1km from the Works Area. Works will be ongoing and the vessels will have restricted maneuverability as they complete their work scopes.

The Communication between the vessels will be through CH67 & 72.

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

Crew Transfer Vessel NOS Exceeder 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.

NOS Exceeder is expected to mobilise from the port of Lowestoft circa 01/08/2026.

Completion of the works will be notified through the cancellation of this Notice to Mariners. Weekly updates on vessel movements will be issued via the EA3 Weekly Notice of Operations

The dropped object occurred at NNG windfarm, and  was the middle section of the crew transfer vessel (CTV), Forth Engineer, fender located on the bow end of the CTV. Whilst the CTV was ‘pushing off’ the wind turbine generator H13, after technicians had vacated it, the fender became loose from the CTV dropping into the sea.  The plan surrounding the dropped object has yet to be finalised. Once finalised-this will be communicated without delay.  It is anticipated the object has sunk to the seabed based on accounts from the CTV operating crew. Risks and dangers to other sea users for navigation is estimated to be low due to the mass being 250 kilograms. 

On behalf of Inch Cape, N-Sea will commence inter array cable installation activities. Cabling will be laid and pulled into the offshore sub station platform and foundation structures as shown in the attached Nptice to Mariners.

The service operations vessel Olympic Taurus will transfer cable preparation and pull in teams to the offshore platform and foundation structures utilising it’s walk to work system, Olympic Taurus is expected to arrive at the work site on or around the 17th of July.

Inter array cables will be surface laid and pulled into the sub station and foundations from the cable lay vessel Altera which is expected to arrive at Inch Cape on or around the 31st of July.

Operations shall be supported by the crew transfer vessel MCS Pampero.

Cable installation operations are expected to continue for several months.

See detailed map on our bulletin website

See detailed map on our bulletin website

See detailed map on our bulletin website

See detailed map on our bulletin website

See detailed map on our bulletin website

Servicing Operations

Operations will involve service vessels working at or near station positions for short durations during suitable weather windows.

Mariners are advised to exercise caution in the vicinity of these positions during active operations.

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.

Total vertical height of unit: approx. 5 m above seabed.

Minimum clearance above highest point: 55 m in shallowest locations. 

Each acoustic monitoring system will comprise: 

• Acoustic release system

• Fish tag detection system (69 kHz)

• Broadband hydrophone and cetacean click-train logger

• Mooring frame with integrated components

On behalf of Inch Cape Offshore Ltd, Enshore Subsea Ltd, shall continue export cable 2 installation operations. 

Export cable 2 sections 1,2 & 3 have been surface laid, coordinates shown below in the attached Notice to Mariners.

CMOS Installer has laid one rock bag at a cable crossing location and seven rock bags on the section 1 cable in the vicinity of the cable landfall at Cockenzie, East Lothian. The cable crossing rock bag has no surface mark, The rock bags at the landfall area are surface marked by red coloured A4 buoys, location and coordinates shownin the attached Notice to Mariners.

The CMOS Installer will return to the work site to commence cable burial on or around the 3rd of July. Burial operations will start in section 2 moving towards the offshore sub station platform, in the attached Notice to Mariners. Burial operations will continue until September. 

Surface laid cable shall be monitored by guard vessels as promulgated in the Inch Cape weekly notice of operations

These HDD operations will involve installing break-out (punch-out) ducts within Sandford Bay. There will be dive works conducted in support of this effort. There will be a dive support vessel and crew transfer vessel supporting these works. Work vessels will be restricted in their maneuoverability at times. There will be divers in the water at times. The work vessels will display appropriate shapes and lights prescribed by the International Regulations for Preventing Collisions at SeaFor these reasons. Crew transfer will occur nominally between the hours of 0700 and 1900 hours. All vessels transiting the area are requested to provide a minimum clearance of 500m from the vessel C-Horizon during marine operations and pass at a safe speed. VHF Channel 16 will be monitored at all times and Security Messages will be issued on this channel. These vessels will also be transmitting on the Automatic Transmission Identification System (AIS).

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.

UPDATE – Due to changes in vessel availability, the Fugro Zephyr will now remain on site until 19 June 2026. The Fugro Quest will arrive on 03 June 2026 at the earliest and continue operations until the survey scope is complete, alongside the Fugro Zenith. 

The guard vessels on site will now be the Ocean Trust and Reaper, which are planned to alternate for the remainder of the survey campaign. 

Please refer to the updated vessel information within the attached Notice To Mariners for further details. There are no changes to the survey scope.

It should be noted that SSE Renewables are not expecting fishers to relocate gear - on this occasion the vessels will aim to work around any gear on location. A scouting/guard vessel will also be contracted to operate ahead of the survey vessels to ensure that this can be achieved. There will be no towed gear as part of this survey. 

The Zenith and Quest (operated by Fugro) will commence operations on 6th April and 25th April, respectively, for a duration of 207 survey days. To account for weather delays and other eventualities, we would like to extend the validity of this notice until 30 November 2026. 

Crew Transfer Vessel Purus Franceswill provide assistance during the construction phase of the East AngliaTHREE Offshore Windfarm Array and will make regular transits between East Anglia THREE CDM and theports of Lowestoft and Great Yarmouth.

Purus Frances is expected to mobilise from the port of Lowestoft circa 20/05/2025.

Completion of the works will be notified through the cancellation of this Notice to Mariners. Weeklyupdates on vessel movements will be issued via the EA3 Weekly Notice of Operations

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. 

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

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

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 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.

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.

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. 

Following the commencement of the EGL2 nearshore English geotechnical investigation (GI) campaign along the EGL2 survey corridor, SSENT and NGET are advising Mariners of the loss of three CPT (cone penetration test) cones from the NG Driller within Notice to Mariners – Block 1 – Nearshore Surveys.

All mariners and stakeholders are advised that Inch Cape shall commence construction support activities.

The multi purpose offshore vessel, Siem Barracuda shall support several foundation component completion work scopes. The vessel shall transfer technicians to foundation structures utilising it’s walk to work system, crew transfer vessels will also support these activities.

Siem Barracuda is expected to arrive at the wind farm site on or around the 21st of May to commence operations which will continue for several months, vessel detail in the attached Notice to Mariners

A service has been completed on the Passive Acoustic Monitoring (PAM) Stations that have been deployed on the seabed, in and at locations around the East Anglia THREE Offshore Windfarm Area.  A total of eleven PAM stations have been re-deployed, two of which are marked by surface buoys. 

The PAM stations will remain on the seabed until approximately 31/10/2027, 9 deployed PAM stations have a 12 m height above the seabed, a weight of 600 kg and their location is not marked by a surface buoy. Two deployed PAM stations are marked by surface buoys, each anchored to the seabed by two 2 tonne anchor mooring weights.

The PAM stations will be serviced periodically with information distributed via future Notice to Mariners. There is an exclusion zone of 250m around each PAM Station, Marine traffic is advised to maintain the safety zone and navigate with caution at all times. 

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

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

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

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

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

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

The 17 construction boundary demarcation buoys will remain in location until the windfarm construction activities have been completed and handed over to the Operations and Maintenance teams.

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

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

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

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

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

Wind Osprey and Wind Pace will install 95 WTGs

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

Lights

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

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

Lights

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

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

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

• 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 works will commence around the 21st of February 2026 continuing until approximately Q2 2027.  The works will be continuous, 24 hours a day.  A chart of the DBB construction area boundary coordinates and a table of WTG location coordinates is provided below. A running list of the completed WTG installations and the next locations to be installed is presented in the Weekly Notice of Operations.

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

During operations, a Statutory Safety zone of 500m radius will be in place around the Voltaire during the installation of WTGs

Seaway 7 deployed a Wave Rider Buoy on the 01/05/2025 within the boundary of the East Anglia THREE Offshore Windfarm Array during the Monopile Noise monitoring campaign as referenced in EA3 NTM 026 - 2025 Monopile Installation (Noise Monitoring Buoy Deployment). The Wave rider Buoy will remain on station until the end of the project.

The Wave Rider Buoy is equipped with a flashing yellow light and has a range of four nautical miles.

Recovery and/or periodic maintenance of the Wave Rider Buoy will be notified via future Notice to Mariners

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

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

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

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

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

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

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

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

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.