News

The survey vessel, Ocean Endeavour, is anticipated to transit from the Hornsea Project Four Offshore Wind Farm Consented Area. In accordance with the Marine Licence Exemption (EXE/2025/00095), the works can begin from 16th May 2025, the likely start date is 24th May 2025. The works will last for approximately four days, excluding weather contingency.

The geophysical survey will include Multibeam Echosounder (MBES)/Backscatter, Side Scan Sonar (SSS), Magnetometer (MAG), and an Ultra-short baseline (USBL) acoustic positioning system will be used to calculate the position of underwater targets.

The Jack Up vessel Apollo will conduct Main Component Exchanges at locations S11 followed by G07. Apollo will be supported by CTV operations provided by MO6 who will be working 24 hours, operating between Montrose and Seagreen Offshore Windfarm. Operations will take place subject to weather and other operational factors from 5th May until 31st May. The only means of direct VHF communications with the vessel is on VHF channel 16.

Please be aware, 500m Safety Zones will be in place for this major maintenance campaign.

As all the Seagreen Wind Turbine Generators are fully commissioned, mandatory 500m safety zones shall be established around any WTG where major maintenance work is being undertaken, where major maintenance is as per the definition given in the 2007 Regulations. The safety zones will be active whenever a major maintenance vessel is at the WTG during the operational phase. Up to five of these safety zones could be concurrently active, but no more than four where there is one active 500m safety zone around the Offshore Sub-station Platform. 

MARINERS ARE REMINDED to navigate with caution and keep continued watch on VHF Ch.70/16 when navigating the area.

The Floating LiDAR buoy has now been removed.

The Floating LiDAR buoy and associated mooring equipment will be recovered to the deck of the vessel Boemmelbas and removed from location. The buoy will not be redeployed.

An additional notice to mariners will be distributed when the Floating LiDAR buoy has been removed.

The Floating LiDAR buoy has light marking characteristics comprising FI (5) Y 20s with a nominal range of 5 nautical miles in addition to transmitting its locations via AIS.

The Floating LiDAR buoy is tethered to the seabed with a single mooring line. The Floating LiDAR buoy has light marking characteristics comprising FI (5) Y 20s with a nominal range of 5 nautical miles in addition to transmitting its locations via AIS.

The Floating LiDAR buoy was first deployed on April 28th 2023 and is expected to remain deployed and on position until April 28th 2025. A Notice to Mariners will be published in April 2025 providing information on decommissioning of the Floating LiDAR buoy.

See detailed map on our bulletin website

In 2025, four surveys are planned between May and July. These trips include two consecutive survey days with two days for travel to and from the survey area from a Dutch port. These trips are planned to take place on: • 19-22 May (survey days 20, 21) • 2-5 June (survey days 3, 4) • 16-19 June (survey days 17, 18) • 30 June - 3 July (survey days 1, 2) And a reserve week is planned as 7-10 July (survey 8, 9).

The vessels carrying out the work will be towing survey equipment and will be limited in their ability to manouvre. Other vessels are kindly requested to give this operation a wide berth with regard to both vessels and gear. The vessels will display the appropriate lights and shapes and will maintain a listening watch on VHF Channel 16.

See detailed map on our bulletin website

See detailed map on our bulletin website

NtM 002-2025 - Blade Inspections

Mariners are advised that on or around the 23rd April 2025 (weather depending), the Cardinal P will conduct a series of internal turbine inspections.   During the blade inspections, the vessel will be tied off in close proximity to the Turbines being inspected (within the 50m zone).  

This work will also involve external ROV inspection of 2 locations and will also be close proximity work to these locations (within the 50m zone) which is expected to start in June 2025 (dates to be confirmed.

NtM 003-2025 & NtM 004-2025 - Jack Up Operations

Mariners are advised that the Jack Up Vessel 'Wind Discovery' is expected to commence operations at the Triton Knoll OWF site conducting a series of construction activities. During these works there will be a 500m exclusion zone around each asset when worked upon.  The Wind Discovery will be supported by the Arabella Jane.

This campaign will be completed in 2 phases as follows: 

Phase 1: 28th April - 14th May 2025 

Phase 2: 17th June – 30th June 2025

NtM 005-2025 - Drone Inspections

Mariners are advised that the Master P is expected to commence operations at the Triton Knoll OWF conducting Drone Inspections on all assets. Whilst drone inspections are being conducted, the Master P will be tied off near the asset and within the 50m zone.

NtM 007-2025 - Cable Protection System (CPS) Stabilisation Campaign The campaign will commence on 27th May 2025 for approximately 50 days (weather depending), including visits to port to reload.

Rock bags will be placed at intervals or adjacent to each other, as required, along selected exposed cable lengths at each of the fixed structure (WTG and OSP) locations across the site, taking approximately 6 hrs at each location. A 500m clearance to the vessel and all fixed structure locations whilst major maintenance works are being undertaken is required. The vessel will be operating 24/7.

Mariners are advised that the following vessels continue to be active at the Triton Knoll Offshore Wind Farm (TKOWF) as outlined within previously issued NtM's:

Mariners are advised that all foundations monopiles have been installed and all inter-array and export cables have been installed.

Navigation Warning - 08th January 2021

Mariners are advised that the remnants of a Wave Rider Buoy sinker weight and partial rigging are located within the Triton Knoll Offshore Wind Farm Construction site at the following location;

53° 30.442N 000° 50.564E

It is advised that the partial rigging could potentially be floating up to 9.7m above the seabed, reducing the navigable safe water in the immediate area to 10m LAT.  Mariners are advised to avoid the indicated position by 250 metres.

Possible Dangers to Navigation - Properties of the polypropylene show that the rope is buoyant, this makes the line sensitive for thruster currents. Taking the site water depth into consideration (19.7m LAT) and the maximum expected height above seabed of the rope 9.7m the line is expected to be floating submerged at approximately -10m LAT. In addition, it is noted that over time sediments will be trapped between the fibres and the heavier rope may finally sink. The polypropylene rope may impose a risk to foul propellers / propulsion of vessels due to the buoyant nature of the rope. As the rope is submerged at a depth of ~-10m LAT the risk is considered minimum for vessels with a shallow draught (<5m) and medium for a vessel with a deeper draught (>5m). Over time sediments will be trapped between the fibres and the heavier rope may finally sink thereby reducing the risk to propellers/propulsion of vessels. The clump weight itself (chain) is expected to have sunk into the seabed and has no significant height above seabed. In addition, the edges of the clump weight are mostly rounded (chain), the risk the clump weigh imposes to fishing activities/gear is therefore considered to be minimal.

Navigation Warning - 16th March 2021

Mariners are advised that two UXO targets have been confirmed within the Triton Knoll Offshore Wind Farm Array.

Mariners are advised that the two confirmed targets are located within 20 metres water depth (LAT) and a 10 metre radius exclusion zone is required around each target.  The following table provides the coordinates and a description for each target.

The geophysical survey involves data collection using both towed and hull-mounted equipment.  All vessels are requested to give the survey vessel a wide berth to and navigate with caution during geophysical survey activities, maintaining a distance of 2NM ahead and astern of the survey vessel.  

The Ramform Vanguard will be supported by the guard/scout vessel 'MV Karelle'.

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

See detailed map on our bulletin website

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

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

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

Operations will be conducted on a 24-hour basis.

Whilst the vessel will tow survey equipment, BBOWF do not require fishing gear to be relocated and can operate around static fishing gear present within the survey area.  

Survey Duration  

The survey is anticipated to commence 26 May 2025 (+/- 2 days pending vessel availability), and will involve 7 days total of operational survey time. To account for weather delays and all eventualities we would like to extend the validity of this notice to 31 July 2025. The survey will be undertaken by an X-Ocean USV. A support vessel will escort the USV from the active ports to clear water. Please note that although the vessel is uncrewed, it will be piloted remotely using 360 degree cameras and other navigational aids. Vessel details are included within the attached Notice to Mariners document.

Survey Tasks  

The surveys involve deployment of: 

• Multi Beam Echosounder; 

• Sub-bottom profiler; 

• Magnetometer; 

• Ultra-short Baseline; and, 

• Sub-bottom Profiler. 

All mariners are advised to keep a safe clearance distance of no less than 500m from the vessel.

The survey involves the drilling, sampling and coring of boreholes throughout the array areas. The vessel will be stationary at each borehole location for up to 3 days to allow the samples and cores to be taken from the seabed. 24 hour and 7day lookaheads containing details of the positions of Fugro Synergy will be provided.  

An Offshore Fisheries Liaison Officer (OFLO) will not be present on board the vessel during the survey but the project Fishing Industry Representative (FIR) and/or Company FLO (CLFO) can be contacted with any specific queries.  

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.

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

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.

See detailed map on our bulletin website

These operations will be conducted at locations where post-cable lay burial operations have not achieved the required level of depth protection.

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

During these rock placement works the “Simon Stevin” will be restricted in its ability to manoeuvre as it carries out the rock placement work and shall also be always exhibiting the correct day shapes/lights. Please note that rock placement will cause a reduction of navigable depth, but this is unlikely to exceed a 10% reduction.

The actual positions of rock placement will be updated as part of the as-built information of the project.  

All Mariners are advised that the 2 Export Cables & 1 Fibre Optic Cable (all bundled) have been installed into the HDD ducts at the Sofia HDD Landfall. 

An MBES survey of the HDD trenches out to KP 3 was recently performed. The survey indicates the spoil heaps from 2023 back hoe excavation works have largely naturally dispersed. One spoil heap remains with a maximum height above the seabed of < 0.2 m and vessels are requested to leave a wide berth as identified for the nearshore exclusion boundary (HDD pits out to KP3) until further notice. 

The following table highlights zonal areas where guard vessels are patrolling and guarding the campaign 1 export cable. 

Mariners are requested to remain where possible 500m from vessels and equipment. Fishing vessels are requested to pass at a safe speed and distance and remain outside of the exclusion area identified. All vessels can be contacted on VHF 16 for further information as required reference proximity/nearby operations etc.

Mariners are advised of the following vessels currently operating at the Sofia Offshore Wind Farm (SOWF) for this scope.

The table below also provides the position and description of any equipment/asset/item that will remain in place following demobilisation of the Ievoli Ivory.

Post completion of rock placement works, the Survey Vessel “Patriot” is expected to carry out non-intrusive depth of cable burial survey works within the Sofia export cable corridor from Nearshore outwards towards the Sofia Offshore Array. Date to be confirmed.

Once Seafox 2 departs the area, the seabed (where Seafox 2 was jacked up) will be surveyed accordingly (Vessel still to be confirmed).

Post survey of the seabed, the Jack Up Vessel – Seafox 7 will be positioned alongside the Offshore Converter Platform, and may arrive in the vicinity prior to the Seafox 2 departing, remaining at a stand off location.

All the above vessels will be arriving from the European Continental Shelf. The whole operation is expected to take 7 – 10 days (weather permitting).

The Jack Up Vessel swap over shall be supported by those vessels detailed within NtM 018-2025 and NtM 020-2025.

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:

• Dina Merkur;
• Dina Scout;
• Dina Supporter;
• Dina Supplier;
• FS Crathes;
• Bos Pool;
• Bos Base;
• Highland Knight - Arrival on site crica. 15th May 2025.

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

All vessels will be arriving from non UK Ports throughout.

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.

The As Laid Coordinates of the anchors are also provided below.

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.

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” commence operations at the Sofia OWF.

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

The Subsea Viking continues supporting the Inter Array Cable Installation works via Survey, Cable Burial, Rock Bag Installation Works, as required.

Service Operation Vessels

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

SOVs Acta Orion and Olympic Orion continue to support Inter Array Cable works.

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

Vessels shall be transiting to / from the Sofia Array and the ports of Blyth & Sunderland throughout this period.

Crew Transfer Vessel

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

Mariners are requested to remain where possible 500m from these vessels, as they will have restricted manoeuvrability and shall also be exhibiting the correct day shapes/ lights.

An additional met-ocean buoy will be installed at KP180 along the export cable route at a later date.

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.

It should be noted that SSE Renewables are not requesting fishers to relocate gear - on this occasion the vessels will work around any gear on location. The survey work is being undertaken by Natural Power, utilising the Windcat 20 as the survey vessel (please see the updated notice to mariners attachment which provides further vessel details). 

Once mobilised the survey will have a four day total duration. To allow for weather delays the expected completion date of the subtidal benthic survey will be 07 April 2025, however to allow for weather downtime, this notice will remain in effect until 31 August 2025.

During the survey campaign, the vessel will deploy an underwater drop down video/camera and mini Hamon grab to gather data on the ecology of the seabed. No towed gear operations will be taking place. The vessel will be generally unrestricted in its movements and will adhere to normal navigation protocol. 

Updated Notice Information  - 16 April 2025

Following completion of drop down video survey, the survey team will return to undertake grab sampling on Friday, 18 April 2025 depending on weather suitability. The vessel will be Gaoth Na Mara, please see the updated notice to mariners for further details. 

Foundation Installation Works (Aeolus)

The Aeolus has commenced the Offshore Foundation Transport and Installation works within the Sofia Offshore Wind Farm Array. These works include the transport and installation operations of primary components, namely Monopiles, and secondary components, namely Main Access Platforms, Internal Platforms, Boat Landings and Upper Ladders.

Vessels shall be transiting to / from the Sofia Array and the ports of Blyth & Tyne throughout this period.

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

The Sofia Offshore Wind Farm Exclusion Zone coordinates, are shown below and included within the relevant NtM.  Mariners are requested to remain outside this Exclusion Zone.

Vessels are requested to pass at a safe speed and distance and fishing vessels are advised to remain outside of the areas identified.

Noise Monitoring Equipment Installation

Noise monitoring equipment installed in the following positions within the Sofia Offshore Array:

***Although all equipment will be submerged during the installation period, ALL Mariners are advised that the navigable water depth within the assigned areas will be reduced by approx. 12 metres due to the equipment protruding from the seabed and are requested to take this into consideration when navigating within the geographical area. In addition, all Mariners are to allow a 100m radius avoidance while the equipment is deployed.***

Service Operation Vessels

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

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

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 restricted in ability to manoeuvre.

Crew Transfer Vessel

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

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

The works will consist of the excavation of 2 cable trenches and the installation of 2 stainless steel export cable ducts, once the ducts are installed the trenches shall be backfilled. Two buoys shall be temporarily deployred to delineate the work site. These works shall include diving operations, please see attached Notice to Mariners for further information.

The Geophysical UXO survey will take place on or around 15th May – 15th June from vessel MV Ivero. The vessel will be operating Scotland and Orkney mainland, outside of main shipping channels.

Ivero will be RESTRICTED in ability to manoeuvre operating towed survey sensors. Vessel will display RAMs day shapes and appropriate signals informing other vessels in the vicinity. During periods of poor weather, Ivero will port call in Scrabster in times when the vessel cannot remain at sea.

The vessel will be listening on VHF Channels 12 and 16 for direct contact.

This entails 4 key types of activity which includes:

1. Mattress Installation,

2. Route Clearance,

3. Debris / boulder removal

4. Pre-Lay Grapnel Run (PLGR)

Please see attached Notice to Mariners for more information.

•    This survey shall take place from 12th  of May 2025 to 3rd July 2025

• Contact details: Onshore FLO: phone: +44 (0)7926 41 88 20, email: OWPLFisheries@xodusgroup.com;
• Offshore FLO: phone +45 32 22 67 06
• Further contact details Luis McArthur: phone: +44 (0)7771 86 28 68, email: luis.mcarthur@westoforkney.com

• Name of vessel carrying out the work and towed equipment used: Connector (Call Sign: OYOJ2)
• Geotechnical Survey Equipment
• Ultra Short Baseline (USBL)
• Port of operation: Scrabster.

The vessels will be limited in manoeuvrability therefore, vessels working in the area should proceed with caution and alert the vessel within 1NM from the cable ship during operations and all activity should remain clear 250m either side of the vessel, 500m corridor in total.

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

Seaspan Situla have deployed Thirteen moored stations on the seabed in a straight transect at distances of 500-750 metres, 1.5km, 3-6km and 8-15km. Each station will have a mounted hydrophone which will sit approximately 2.5 metres above the seabed. The vessel-based deployed hydrophone is positioned in the middle of the water column. Seaspan Situla have deployed One wave rider buoy to monitor conditions withing the East Anglia THREE offshore Windfarm Area as detailed in section 2.2 The Wave rider buoy is equipped with a flashing yellow light. Light Range – 4 nm All vessels are required to maintain a 500m safety distance from this position.

Service of the 12 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.

An additional 5 PAM stations will be deployed in positions found in the attached NTM 025-2025. 

For further information regarding PAM station servicing, please see attached East Anglia Three Notice To Mariners 027- 2025.

The survey vessel Titan Discovery will be surveying an area up to 5km offshore of the HW mark close to Abergele, North Wales.  This survey is being conducted prior to maintenance work that is due to be carried out on one of the export cables later this year.  The location of the survey area is illustrated in the Notice to Mariners (here) and the boundaries are listed below:-

• Waypoint 1: 053° 17.703’N 003° 35.408’W
• Waypoint 2: 053° 19.348’N 003° 38.564’W
• Waypoint 3: 053° 20.484’N 003° 36.777’W
• Waypoint 4: 053° 18.287’N 003° 33.395’W

The survey work is due to start on the 5th May 2025 and to last up to 25 days.  These dates are subject to weather and sea conditions.

Vessel details

The survey work will be carried out by the vessel Titan Discovery which is a catamaran workboat measuring 13m in length, 5m beam, with a yellow hull.  The vessel details are:-

• Titan Discovery: Research / survey vessel | Call sign 2HCR3

Survey operations will be conducted on a 12-hour basis.  The vessel will display the prescribed lights and signals for survey operations and will monitor VHF Channel 12 & 16 at all times.

During this survey the vessel may be towing equipment and will be restricted in its ability to manoeuvre. Other vessels are requested to pass at a safe speed and maintain a wide berth of at least 500m distance.

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

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

Maintenance activities will include but not be limited to:

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

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

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 therfore 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 ability to undertake its contracted works, fishermen who have static fishing gears deployed within 500m 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 the static gear must be marked in accordance with Commission Implementing Regulation (EU) No. 404/2011 (http://www.gov.uk/guidance/marking-of-fishing-gear-retrieval-and-notification-of-lostgear#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 requested to navigate with caution, to use all means appropriate to aid safe navigation as defined under COLREGs Rule 7, and keep continued watch on VHF Ch. 16, 87 and 73 when navigating the area.

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 30 (thirty) sets of Passive Acoustic Monitoring (PAM) moorings have been deployed across an area approximately encompassing the Dogger Bank C array area boundary plus a 40km buffer, indicative coordinates are included below. The PAM moorings will remain in place for approximately 4 months before being recovered in July 2025.

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

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

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

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

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

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

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

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

•           At least 2 nm range.

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

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

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

Mariners are advised that, as of 2nd May 2025, Hornsea Three have identified and confirmed 13 pUXOs as cUXOs within the Hornsea Three array area, the coordinates of which are provided in Table 1 and shown in Figure 1. All vessels are requested to maintain the required safe distance (500m) as defined from the coordinates set out in Table 1 and Figure 1. The EOD works for the Hornsea Three array area, are expected to be undertaken in a separate campaign commencing in Q3 2025. 

Seabed Preparation Survey:

Mariners are advised that Orsted will be commencing a bathymetric survey for the purpose of seabed preparation works for the Hornsea Three Export Cable Route (ECR), located within the UK Sector of the North Sea. The survey vessel, MJM Enterprise, is anticipated to mobilise from Hartlepool, UK on 5th May 2025 and commence investigations along the Hornsea Three ECR and Interlink Cable Route (ICR) from 6 th May 2025. The works will last until approximately mid-May 2025, allowing for mobilisation, survey operations, de-mobilisation and weather contingency.

Boulder and Debris Relocation Works:

Mariners are advised that Orsted will be commencing boulder and debris relocation to support seabed preparation works for the Hornsea Three ECR. The boulder and debris relocation works will be performed by the ‘Glomar Worker’ by means of a hydraulic grab. The Glomar Worker, is anticipated to mobilise from Grimsby, UK on 15th May 2025. The works will continue until approximately July 2025, allowing for mobilisation, operations, de-mobilisation and weather contingency.

The works will commence on approximately the 15th of May 2025, continuing until approximately 11th of September 2025. The works will be continuous 24 hours a day. A chart of the DBC construction area and the installation location is provided below.

During operations, a Statutory Safety zone of 500m radius will be in place around the HEA Hydra for the duration of the Commissioning phase of the DBC OSP. Vessels are requested to maintain a minimum safe passing distance of 1km from the HEA Hydra during the operation.

The Platform Supply Vessel (PSV) FS Balmoral will support the HEA Hydra, carrying out regular supply runs to the offshore site.

During the Commissioning phase, there will be a requirement for rope access works to be carried out to the external parts of the OSP and Jacket. During these Over the Side (OTS) works the Dogger Bank OWF Guard vessel Jacobus will act as the Emergency Response Rescue Vessel (ERRV).

ELECTRICITY (OFFSHORE GENERATING STATIONS) (SAFETY ZONES) (APPLICATION PROCEDURES AND CONTROL OF ACCESS) REGULATIONS 2007 SAFETY ZONE APPLICATION FOR Implementation of Safety Zones for Removal of Turbine T06 and for Major Maintenance Events During Operation of the Wind Farm Notice is hereby given that Mr George Cottell, RWE Renewables UK Scroby Sands Ltd, Windmill Hill Business Park, Whitehill Way, Swindon, SN5 6PB, has applied to the Marine Management Organisation under Section 95 of the Energy Act 2004 for a safety zone application at Scroby Sands Offshore Wind Farm. Copies of the application and associated information may be viewed on line in the Public Register at www.gov.uk/check-marine-licence-register    Representations in respect of the application should ordinarily be made by: - Visiting the MMO public register at https://marinelicensing.marinemanagement.org.uk/mmofox5/fox/live/MMO_PUBLIC_REGISTER/search?area=3 and accessing the `Public Representation’ section of case reference MLA/2025/00111; However, we will also accept representations via the following formats: - By email to marine.consents@marinemanagement.org.uk; or alternatively - By letter addressed to Marine Management Organisation, Lancaster House, Hampshire Court, Newcastle upon Tyne, NE4 7YH In all cases, correspondence must: - Be received within 28 days of the date of the first notice (Friday 9th May 2025); - Quote the case reference; and - include an address to which correspondence relating to the representation or objection may be sent. The Marine Management Organisation will pass to the applicant a copy of any objection or representation we receive.  

Some of the USVs may need to be assisted by the support vessels to survey. While the USV is engaged in survey operations the support vessel may transit back to port or standby offshore depending on operational need.

Survey operations will be continuous 24hrs a day. Although vessels are uncrewed, they are managed remotely continuously using 360 degree cameras and other sensors. A maximum of 2 USV’s will be on site at one time.

The works will commence from 8th of May continuing until 30th of June 2025. A chart of the survey area, including bounding coordinates, is provided below. 

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

The works will commence on approximately the 08th of May 2025, continuing until approximately the 25th of May 2025. The works will be continuous 24 hours a day. A chart of the DBC construction area and the installation location is provided below. The progress of the installation work and its completion is presented in the Weekly Notice of Operations. 

During operations, the SSCV Sleipnir 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 SSCV Sleipnir during the installation of the DBC OSP Topside. The AHT Bylgia will pre-deploy anchors (10No.) in an area within approximately to 2km radius from the OSP installation location. SSCV Sleipnir will arrive and position on the pre-deployed anchors and deploy a further 2No. anchors for a total of 12No. anchors deployed.  Vessels are requested to maintain a minimum safe passing distance of 2km from the SSCV Sleipnir during the operation. 

There will also be 1no. tow tug Pacific Discovery towing 1no. unmanned cargo barge carrying the OSP Jacket and 1no. tow tug Pacific Dispatch will be towing 1no. unmanned cargo barge carrying the OSP Topsides and 1no. tow tug Fairplay 31 will be towing 1no. unmanned cargo barge which will be used as a spacer barge for the installation activities. Siem Challenger will take over from Pacific Discovery. Bylgia and Pacific Discovery will be used as anchor handlers to connect SSCV Sleipnir to pre-laid anchors. See the table below for details. Tow tug and AHTs will also transmit AIS messages. 

The safety zones will be monitored by a guard vessel. The primary responsibility is to warn passing traffic of the ongoing works and active safety zones.

Major Maintenance works will be carried out to replace an inter-array cable on Beatrice Windfarm involving the use of a cable repair vessel (North Sea Enabler). This work will be undertaken from the 14th of May lasting until July 31st. The vessel will operate at one area on the Beatrice Windfarm.

Work will involve the removal of the existing inter-array cable and replacement. The cable will be laid within the existing trench as far as reasonably practicable using a control flow excavator. It is expected that the trench will naturaully backfill, and caution should be excersised during this time over the area. Further details will be provided at a later date regarding a guard vessel over the exposed cable.

The vessels will be limited in manoeuvrability therefore, vessels working in the area should proceed with caution and alert the vessel within 1NM from the cable ship during operations and all activity should remain clear 250m either side of the vessel, 500m corridor in total.

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

Abeko Server 2 will be positioned at the HDD locations to begin seabed excavation for pit and trench creation and will carry out spoil management activities along the trench. The Abeko Server 2 will be manned 24 hours on site, with the Afon Alaw providing support for barge movements and towing as needed. During operations, the Abeko Server 2 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. The Isle of Jura will deploy a four-point mooring spread, including chain clumps, ground and riser chains, mooring cans with yellow marker lights, and flashing sequences. An Alucat vessel will assist in connecting and disconnecting the Isle of Jura mooring lines to the mooring array.

1. 1. Area of operations:                                    WGS84

Latitude              Longitude

• A02 – Generator exchange          57° 13.420' N    2° 00.758' W
• A04 – Generator exchange          57° 14.010' N    1° 59.371' W
• A05 – Generator exchange          57° 14.405' N    1° 58.551' W
• B01 - Generator exchange           57° 12.948' N    2° 00.671' W
• B03 - Generator exchange           57° 13.203' N    2° 0.0013' W
• B05 - Generator exchange           57° 13.465' N    1° 59.274' W

1.1.2 Schedule

DATE OF OPERATION START: 06/05/2025

TIMES OF OPERATION: 24hrs

LENGTH OF OPERATION: 3-4 weeks depending on weather

2 Jack up Operations / AOW NTM 040

2.1 Equipment

Work will be conducted from the Jack up vessel Wind Osprey. Vessels are requested to remain 500m away from Wind Peak whilst she is deployed in the windfarm. Wind Osprey will display the lights and shapes prescribed in the International Regulations for the Prevention of Collisions at Sea (COLREGS).

The works will continue over the winter. The vessel will further be assisted by the Walk to Work Vessel SUDRI ENABLER for the deployment of cable pull in teams. Shortly after the start of the cable installation, the Trenching Support vessel (TSV) C-INSTALLER will be mobilised to site for the burial of the installed cables. All works will be continuous, 24 hours a day. Charts of the DBB array area are provided below.

The cable lay vessel will deploy the inter array cable onto the seabed through her dedicated deck spread. The cable will remain exposed on the seabed till trenching works by C-INSTALLER are performed.

During operations, the VIKING NEPTUN, C-INSTALLER and SUDRI ENABLER 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. 

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

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

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

Maintenance activities will include but not be limited to:

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

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

Mariners are advised that Partrac, on behalf of The Crown Estate, is planning the full recovery of the array of Metocean equipment and floating LiDAR buoys deployed within three Project Development Areas (PDAs) located in the Celtic Sea, off the coast of Wales and Southwest England. The equipment was deployed on the 09th and 10th May 2024 and remained in place for a period of 12 months.

Vessel mobilisation for the recovery is anticipated to be carried out on or after the 10th May 2025, using the Mar Fortune. The duration of the deployment works is estimated to be 2-3 days, excluding weather downtime.

During operations NKT Victoria 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.

In the period between late pull-in operations until the cable has been permanently protected by means of burial or rock placement, the cable may be locally exposed on the seafloor and the construction working corridor will remain closed for any static fishing, anchoring or use of other equipment with seabed intervention. During this time the cable is sensitive to any external impact and constitutes a snagging risk for anchoring, fishing gear or other equipment with seabed intervention.

See detailed map on our bulletin website

Green Volt Offshore Windfarm Limited (GVOWL) will be carrying out a seismic refraction survey at the proposed export cable landfall site at St. Fergus South Beach, north of Peterhead, during low tide in May 2025. The survey will take place in the intertidal area, at least 20m from the waterline and is anticipated to last 5 days. The seismic refraction survey will comprise of the installation of 2 geophone lines (142m each) to measure ground vibrations.

The methods used will include striking a plastic plate with a sledgehammer and triggering a blank shotgun shell buried in the sand. The purpose of this survey is to study how seismic waves move through the beach sediment.

Equipment will be removed daily, and no chemicals will be used. Access will be via quadbike, ensuring minimal environmental disturbance. No navigation hazards will be created.

Several confirmed unexploded ordnance items have been located during unexpoloded ordnance identification and mitigation works.

Inch Cape will promulgate any relocation, or disposal plans in due course, if further information is required, please contact the Duty Marine Coordinator on the number above.

Please be advised that Aspect Land & Hydrographic Surveys Ltd (on behalf of SHEPD) will be undertaking subsea surveys in the Outer Hebrides marine area. Please refer to Figure 1 that highlights the survey area. The surveys are scheduled to commence on the week commencing Monday 12th May 2025, and be completed by August 2025.

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

Start dates and anticipated durations listed against each individual location in the attached NtM.

LOCATION DETAILS

The survey corridor is noted in the attached NtM for information. Equipment calibration operations may take place out with the defined corridor and these areas will be chosen so as not to interfere with fishing / marine traffic activity.

VESSEL DETAILS

The vessels conducting these works will be restricted in their ability to manoeuvre and will display the appropriate lights and shapes.

Other vessels are requested to pass at a safe speed and provide a minimum clearance of 500m (COLREGs Rule 16 & 18) during marine operations.

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

The floating LiDAR buoys deployed at sites 1 and 3 record meteorological data and are anchored to the seabed by means of a mooring chain and a ground weight. The buoy has dimensions of 4m x 4m, and when deployed the tallest mast on the buoy sits approx. 4m above the water line. The lantern has a flash sequence Fl (5) Y 20s. Please maintain a 500m exclusion around each buoy.

Overview 

Mariners are advised that SSE Renewables will be returning to Berwick Bank Wind Farm area to continue Geotechnical survey work. The survey will be within the proposed Berwick Bank Wind Farm site boundary (see Figure 1 within the attached notice to mariners,  respective co-ordinates are listed in Table 1).   

It should be noted that SSE Renewables are not expecting fishers to relocate gear - on this occasion the vessel(s) will aim to work around any gear on location. A scouting/guard vessel will operate ahead of the survey vessel/s to ensure that this can be achieved. 

The survey work is being undertaken by Fugro and will be conducted by multiple vessels. The scouting/guard vessel will be the Courage or the GV Reaper. 

Updated Information - 08 April 2025

The Gargano is due to complete Cone Penetration Testing operations on the site by 13 April 2025. The Quest vessel, owned by Fugro, will commence a borehole campaign on the site starting 21 April 2025 at the earliest. The guard vessels will continue to be either the Courage or the Reaper alternating approximately every 21 days. Please see the attached Notice to Mariners for the vessel details.   

Update Information - 24 April 2025

The Gargano (operated by Fugro) completed Cone Penetration Testing operations on 12 April 2025. The Quest vessel, operated by Fugro, will commence a borehole campaign on the site starting 25 April 2025 at the earliest. A third vessel operated by Fugro, named RS Alegranza (formerly Wind of Pride) will support on the survey campaign for up to one week on site, commencing work on 30 April 2025 at the earliest.

The guard vessels will continue to be either the Courage or the Reaper alternating approximately every 21 days. Please see below for vessel details.  We would like to extend the validity of this notice until 30 September 2025. 

The exposures are present intermittently across all four cable routes as shown below/on the map.

Application for licence to remediate exposures has been submitted. Fishermen are requested to stay well clear.

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.

The USVs will be mobilised using two methods.

1.) From the shore from Scarborough or Hartlepool Harbour where each USV will be escorted out of the harbour limits, before transiting to the survey area.

2.) From a mothership (ILV Granuaile) which will deploy the USV’s directly on site using a launch & recovery system (LARS) Some of the USVs may be assisted by support vessels to complete the survey works. While the USV is engaged in survey operations the support vessel may transit back to port or standby offshore depending on operational need. Survey Operations will be continuous 24hrs a day. Although vessels are uncrewed, they are managed remotely continuously using 360-degree cameras and other sensors.

The main works commenced on the 13 th of August 2024, continuing until June 2025 when all locations have been surveyed. The works will be continuous, 24 hours a day.

A chart of the DBD Array Area and Export Cable Route corridor including bounding coordinates is provided below. It is requested that all vessels maintain a minimum of 500m separation distance from the USVs and pass at reduced speed.

The works are expected to commence on the 6th of May 2025, continuing until the OSP jacket piling is complete. The works will be continuous, 24 hours a day. Charts of the DBC construction area and noise monitoring locations are provided below.

In advance of the foundation installation, the Wind Evolution will deploy two transects of up to 4 (four) hydrophones on the seabed. The distances are between 750m and 10,000m from the OSP position. Noise measurement equipment will consist of Autonomous Recording Units (ARUs) with one low sensitivity (Hi-SPL) hydrophone per unit at an approximate 2/3rd water depth. Each ARU will be moored by a fixed weight to the seabed and will be removed on completion of the piling operations

During operations, the Wind Evolution 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 Wind Evolution and pass at reduced speed. It is also requested that all vessels maintain a minimum of 100 m separation distance from the deployment positions provided below.

Route clearance of out of service cables, boulders and debris will be performed between KP4 -KP148 of the East Anglia Three Export Cable Route & within the boundary of the EA3 windfarm array. Inspection operations will be performed at third-party asset locations.

During periods of operation, vessel Trym will be restricted in her ability to manoeuvre. All vessels are requested to keep a minimum safe distance of 1000m from the vessel and pass at a reduced speed, fishers are requested not to deploy gear within the 500m fishing gear exclusion zone. For further information, please see attached East Anglia Three Notice To Mariners 011-2025.

Mobilisation of the Njord R, Ask R and USS 202 is anticipated from 24 April 2025 on site to commence pre-sweeping activities from 28 April 2025 onwards. The full scope of works are anticipated to take 5-6 months (weather dependent). Work is carried out from KP 78.9 (51º 48.2’ N 01º 38.0’ E) to KP 199.1 (52º 23.6’ N  02º 45.9’ E). Pre-sweeping activities between KP 78.9 to KP 145 are anticipated to be completed between 28 of Apr and beginning of June (weather dependent, it can take longer).

All vessels involved in operational activities will exhibit appropriate lights and day-time shapes prescribed by the International Regulations for Preventing Collisions at Sea, relative to operations. The vessel will also transmit an Automatic Identification System (AIS) message.    

As part of the annual operations and maintenance of assets, geophysical surveys will be taking place within the Moray Offshore Windfarm (West) Limited (Moray West) site. The geophysical survey scope will include Multibeam Echosounder (MBES) of all buried inter array, interconnector and export cables, and MBES at a 300m2 area around all 60 monopiles.If any anomalies are identified, Side Scan Sonar (SSS) with USBL will be employed for further investigation along small parts of the cable routes. Survey equipment will be hull mounted with the exception of small areas where the SSS with USBL will be used, and this equipment will be towed.

Mariners are advised about Marine Survey Works for the Eastern Green Link 5 Project (EGL5).

EGL5 Project will play a vital role in achieving the UK and Scottish Government’s net zero targets and significantly increase the UK’s capacity for clean, green renewable power.

The project comprises a 2GW, 525kV High Voltage Direct Current (HVDC) connection between offshore Scottish and Southern Electricity Networks – (SSEN) Transmission’s licensed area to the National Grid Electricity Transmission (NGET) Lincolnshire Connection Node. This comprises ~585km of HVDC offshore cable and in Lincolnshire, ~10km HVDC onshore cable and an HVDC converter station.

The EGL5 marine survey works are being carried out by ‘XOcean’ with Remotely Operated Vessels (ROV’s) XO06, XO16, XO17, XO19, XO23, X026, XO27, and support vessels ‘Elysse II’, and ‘RLM CERBERUS’. The survey will include non-intrusive geophysical work to collect bathymetric data, seabed imagery and sub-bottom imaging.

The area of work pertaining to this Notice to Mariners (NtM) is illustrated in Figure 1 and Table 1, with the survey and updated support vessel contact details found in Tables 2 and 3. Contact details, including the project’s Fisheries Liaison Officers are detailed below.

The marine geophysical survey activities for EGL 5 will commence from the 23rd April 2025. The survey is due to be completed by the end of June 2025, subject to weather.

The survey vessels shall be unmanned vessels/ uncrewed surface vessels (USVs) and will be able to operate around static fishing gear. Therefore, fishing gear clearance is not being requested.

All vessels are requested to pass at a safe speed and distance, approximately 500 metres where possible (COLREGs Rule 16 & 18) from the areas identified during marine survey operations. The survey vessels shall operate without any towed equipment and remain fully manoeuvrable during survey activities The survey vessels will monitor VHF Channel 16 at all times. Mobile contacts for the vessels are listed at the end of this NtM.

*The height of external cable protection is expected to be 2.06 m between KP 163 & 164 (DBB cable crossing).The water depth at the crossing is 23.24m following rock placement this will result in a minimum under keel clearance of 21.18m and a water depth reduction of 8.9%* 

*The height of external cable protection is expected to be 2.06 m between KP 165 & KP 166 (SEAL pipeline crossing). The water depth at the crossing is 24.37m, following rock placement this will result in a minimum under keel clearance of 22.3m and a water depth reduction of 8.4%.*

Fishing vessels are requested to pass at a safe speed and distance and remain outside of the exclusion area identified.

Mariners are advised of the following vessels currently operating at the Sofia Offshore Wind Farm (SOWF) for this scope.

Vessels will be monitoring channel VHF 16 and shall also be exhibiting the correct day shapes/lights and flag for vessels restricted in ability to manoeuvre.

Export Cable Route Preparation Works

The table below details the coordinates of project infrastructure to remain on the seabed following the Ievoli Cobalt’s completion of works. The mattresses are not expected to reduce navigable depth by over 5%.

Rock berm installation has been installed to an average height of approximately 1.6m above seabed level, which represents and average reduction in depth at Lowest Astronomical Tide (LAT) of approximately 6%.

Please be advised that Briggs Marine (on behalf of Ossian Offshore Wind Farm Ltd) will be undertaking benthic sampling and drop-down video operations within the corridor identified in this notification. Please refer to Figure 1, that shows the location of the corridor along with planned sample locations. Benthic sampling and drop-down video operations will take place between 3 rd and 31st May (weather permitting) starting at the Lincolnshire coast working north.

Markers Deployed:

Four yellow buoys have been deployed. These are approximately 1000-litre in size.

Note that the buoys currently have no lighting characteristics and as such, the following control measures have been implemented:

1. 1. Guard Vessel: The Paul D will return to Ramsgate at approximately 19:00. During this transit, the markers will continue to be guarded by a guard vessel, Lady Ann. This will be communicated as sécurité message via VHF.
   2. Exclusion Zone and Notifications: Upon returning to the marker location, the Paul D will issue another Sécurité message via VHF to inform surrounding traffic and declare an exclusion zone around the markers. A 24/7 anchor watch will be maintained, and vessels in the vicinity will be kept informed.
   3. AIS Notifications: The vessel is currently transmitting AIS message of 500 m exclusion zone for diving operations to further assist in identifying the area as a point of caution.
   4. Watch Continuity: The Paul D will remain on site overnight. Upon its return to Ramsgate in the morning, the guard vessel will return and will remain on station to continue monitoring and securing the area.

Please contact myself or Max Schneider, Project Manager (Max.Schneider@globalmarine.co.uk) if you have any queries regarding this notification or if you have any information on any underwater activity in this area that is relevant to the operation.

The survey involves the drilling, sampling and coring of boreholes throughout the two Array Areas. The vessel will be stationary at each borehole location for 1 to 3 days, depending on borehole depth, to allow the samples and cores to be taken from the seabed. 24 hour and 7-day lookaheads will be provided, containing details of the positions of Horizon Geodrill.

An Offshore Fisheries Liaison Officer (OFLO) will not be present on board the vessel during the survey, but the project Fishing Industry Representative (FIR) and/or Company FLO (CLFO) can be contacted with any specific queries.

Contact details for the FIR and CFLO are provided in attached.

The site is now under operational control, and Moray West is looking to remove construction lighting and buoyage from the area. All operational lighting has been installed and functional as per the Moray West Lighting and Marking Plan and has been approved by NLB following a site inspection.

See detailed map on our bulletin website

The Geo Ocean VI will complete environmental and geotechnical sampling along the proposed Mares Connect subsea cable route, sampling stations every 1km along the proposed route. The vessel will be surveying using drop-camera, environmental grabs, CPT and vibrocore.

The vessel will be stationary using dynamic positioning during the sampling works.

The closest point of approach to the vessel is 500m due to overboarding of equipment over the stern.

Operations are expected to commence 12th April 2025 until 29th May 2025. 

The Geo Surveyor VIII will complete geophysical survey operations along the proposed Mares Connect subsea cable route, surveying a 500m corridor along the planned route from 3mLAT in Wales to 15mLAT. The vessel will be surveying using multibeam echosounder, side-scan sonar, magnetometer and sub-bottom profilers.

The side-sonar and magnetometer will be towed subsea at approximately 6m from the seabed, up to 4 times water depth (expected max tow 60m). One of the sub-bottom profiler will be towed behind the vessel with accompanying streamer at a distance of approximately 50-100m behind the vessel.

The closest point of approach to the vessel is 500m due to towed equipment.

Operations are expected to commence 17th February 2025 until 29th April 2025

27/03/25: Updated NtM attached due to expected later end date for Geo Ocean VI (11th April 2025). 

09/04/2025: Updates as per description above and attachment date 9th April 2025.

The remaining FLiDAR is scheduled for removal in November/December 2025, inclusive of any delays due to adverse weather conditions. An accurate removal date, along with vessel details for the operation, will be provided in the next update in due course.

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.

All instrumentation is deployed at a single deployment location within the project site. The purpose of the instrumentation is to gather Metocean and wind data to inform the proposed Muir Mhor Offshore Wind Farm Project.

All instrumentation was deployed by Green Rebel from the Port of Aberdeen to the site in February 2023 via the vessel BB Ocean (IMO 9196503, MMSI 258825000). 

The FLS mooring comprises of a surface visible buoy moored to the seabed via a two-point mooring system constructed using a combination of rope and chain.  Two guard buoys are located at approximately 30m from the main FLS buoy in a North/South orientation, with the mooring spread covering an approximate 315m radius. There is also a seabed frame for current measurements contained within the overall deployment footprint, approximately 30m East of the main FLS buoy. Note: there are 2x orange polyform marker buoys located above the northern anchor position (detailed below) which will be removed during the first planned maintenance visit.

The FLS light characteristics are Fl (5) Y 20s with 5nm range. The guard buoys’ light characteristics are FI Y 5s with 3nm range and include a yellow St. Andrew’s Cross topmark. The FLS is designated as “Muir Mhor Floating Lidar” on AIS, with MMSI number 992351400.

Details of the surface visible buoy, guard buoys, seabed frame and mooring arrangement are provided in the attachments.

MARINE USERS are requested to maintain a safe clearance distance of 500m from all assets.

Metocean instrumentation and a floating LiDAR system (FLS) have been deployed by Green Rebel within the boundary of the proposed Muir Mhòr Offshore Wind Farm Project site in the North Sea since February 2023.

Due to completion of the metocean survey, the demobilisation of the waverider buoy and seabed frame is scheduled to take place during March or April 2025, subject to weather. The works will be executed from Peterhead Port by the vessel GAOTH NA MARA. ALL VESSELS ARE REQUESTED to give the vessel engaged in the replacement activity a wide berth. 

MARINERS ARE REMINDED to navigate with caution and keep continued watch on VHF Ch. 70 / 16 when navigating the area.

Underwater noise monitoring will be carried out during the installation of twelve monopile foundations. The works are expected to commence on the 17th of April 2025, continuing until installation of the first twelve monopile foundations piling is complete. The works will be continuous, 24 hours a day.   For each monitored piling event, the Wind Evolution will deploy a transect of up to 4 (four) hydrophones on the seabed. The distances have been set at 750m, 1,500m, 5,000m and 10,000m from the piling site. Noise measurement equipment will consist of Autonomous Recording Units (ARUs) with one low sensitivity (Hi-SPL) hydrophone per unit at an approximate 2/3rd water depth. Each ARU will be moored by a fixed weight to the seabed and will be removed on completion of the first twelve piling locations. ARU deployment locations are included below. During operations, the Wind Evolution 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 Wind Evolution and pass at reduced speed. It is also requested that all vessels maintain a minimum of 100 m separation distance from the deployment positions .

Please be advised that Moray Offshore Windfarm (East) Limited (Moray East) are planning to undertake geophysical surveys within the site boundary (Table 1 and Figure 1). Survey operations will be carried out by the Geosurveyor XI which is expected to arrive at site circa 18th April for 1 day then 1st June for 41 days (inclusive of weather downtime). The survey will take place within the red boundary in Figure 1.

The geophysical survey scope will include Multibeam Echosounder (MBES), Side Scan Sonar (SSS) of all buried cables and a 300m2 area around jackets shown in The coordinates of the work site boundary are presented in the below Table 1.

Table 1: Moray East Site boundary

1. General Safety Advice

Please be aware that, during the survey activities, by virtue of its mode of operation the vessel (Geosurveyor XI) 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 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-of-lost- gear#marking-of-fishing-gear)

1. Contact details

The following contact can provide more information if required. Please note that specific queries can also be addressed to the relevant vessel or shore-based representative.

Please be aware that, during the survey activities, by virtue of its mode of operation the vessel (Manor Vulcan) 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 thier vessels and gears at a minimum safe passing distance from the vessel of 500 meters when it is undertaking work and showing the appropriate shapes and lights in accordance with COLREGs Rule 27.

In order not to comprimise the safety of the Survey Vessel, their crew, and their ability to undertake its contracted works, fishermen who have static fishing gears deployed within 500m from the WTG where survey activities are planned (see Table 1 & 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.

As part of the annual operations and maintenance of assets, general visual inspection of the asset foundations and geophysical surveys will be taking place within the Moray Offshore Windfarm (West) Limited (Moray West) site.

Asset foundation inspections will be carried out by the Manor Vulcan which is expected to arrive at site circa 9th April for 1 day, returning on 12th June for 78 days

Scope of work includes the General Visual Inspection (GVI) of Wind Turbine Generator and Offshore Substation Platform foundation assets across the site including the transition piece, monopile, cable protection system and scour protection. The inspections shall be carried out through use of an Unmanned Aerial Vehicle (UAV) for above water works and a Remotely Operated Vehicle (ROV) for below water works. The work will be performed from the Manor Vulcan.

The offshore site survey of the proposed Morgan (Generation Assets) and Mona Offshore Wind Projects array areas, to be carried out by the Ocean Observer. A variation of licence has been granted to extend the survey areas slightly to accommodate the turn of the vessel. The extent of these Greater Working Areas (GWAs) is now included within this notice (See Figure 1 and Table 1&2)

The vessel will be making a crew change in at the port of Barrow between the 2nd and 3rd April 2025. The vessel will then continue to carry out geophysical works within the Morgan GWA.

The investigation being conducted by the Ocean Observer includes both geophysical and shallow geotechnical surveys, commencing at the Morgan site (subject to weather conditions). It should be noted that the Morgan and Mona Greater Work Areas apply only to the geophysical survey activities to accommodate line turns and vessel manoeuvrability. No geotechnical works will be undertaken outside the array (licence) areas (see Figure 1, Table 1 and Table 2).

These surveys will utilise Side Scan Sonar (SSS), Sub-Bottom Profiling (SBP), Magnetometry (Mag), and Multi-Beam Echo Sounding (MBES) along the Inter Array Cable (IAC) route. Following the geophysical surveys, we will carry out shallow geotechnical survey using Cone Penetration Testing (CPT) and Vibrocore (VC).

Regular lookaheads of the vessel position will be provide by the project FIR.

At the time of issuance, the Ocean Observer is undertaking geophysical data acquisition along the Morgan inter-array cable (IAC) corridors.

An Offshore Fisheries Liaison Officer (OFLO) will be present on board the vessel during operations and can be contacted via VHS on channel 16.

Contact details for the FIR and CFLO are provided in this notice.

AIS - no AIS data for HS1, HS2, HS4 and HS5 - fault finding and repair to be conducted at earliest opportunity.

HS1 and HS4 - Nav aid lighting on the WTGs is faulty - fault finding and repair to be conducted at earliest opportunity.

HS1 has fault aviation lighting - fault finding and repair to be conducted at earliest opportunity.

The geophysical survey will be undertaken within the Survey Area, with a 1.5 km buffer around it to allow the survey vessel to turn between survey lines (please refer to the map in the ‘Activity Area’ section below which displays both the Survey Area and 1.5 km buffer).

The MV Mainport Edge will use a range of acoustic and sonar sensors to investigate the seafloor and sub-surface, these will either be attached to the hull of the survey vessel or towed by the survey vessel for the duration of the geophysical survey.

The MV Mainport Edge will transmit regular automatic transmission system messages during the geophysical survey.

ROV Inspections of foundations across 28 WTG locations

A towed geophysical array, at a length of approx. 120m, will be conducted inside the Kentish Flast and Thanet Offshore Windfarms. The vessel (Spectrum 1) being used will be restricted in her ability to manouver due to the towed equipment. 

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

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

Outer Dowsing Offshore Wind (a joint venture between TotalEnergies, Corio Generation and Gulf Energy) are conducting a 3.5 month offshore geotechnical survey between 28th April and 08th August 2025 using the vessel Dina Polaris call sign: CQOF. The survey vessel shall be conducting geotechnical boreholes at various locations within the proposed offshore wind farm area. The vessel will typically spend one to two days static at each sample location within the area so please allow a safe distance.

Company: Outer Dowsing Offshore Wind

Contractor: Geoquip Marine Operations AG

Survey Vessel: Dina Polaris

Survey Vessel call sign: CQOF

Earliest Start date: 28th April 2025

Latest Finish date: 8th August 2025

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

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

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

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

Works are expected to be completed by November 2025.

The survey work consists of 3 different phases with all 3 vessels mobilising at different periods and will operate simultaneously however the total expected duration for all the works with all 3 vessels is approx. 100 days. Operations will comprise the following phases:

- Phase 1 – Nearshore and Offshore Surveys comprising a towed array of hydrographic survey equipment approx. 150m in length within the boundary coordinates outlined within this notice. This phase is expected to last approx. 74 days in total.

- Phase 2 – Environmental Survey within the same boundary coordinates at the later end of the period comprising various stationary elements. This phase follows on from Phase 1 and is expected to last approx. 12-15 days in total.

- Phase 3 – ROV survey within the same boundary coordinates at the later end of the period – most likely to be the same vessel as in Phase 2. This phase follows on from Phase 2 and is expected to last approx.. 14-18 days in total.

Both offshore vessels will operate 24hrs whilst the nearshore vessel will operate 12hr days exclusively within the 12nm zone.

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.

See detailed map on our bulletin website

Sheringham Shoal windfarm will be undertaking additional works outside of scheduled maintenance commencing 20th March 2025. This work will involve the retrofit of the Push on Plates (PoPs) on 80 WTGs and the 2 Offshore Substations to allow “Walk to Work” operations to be completed via Service Operation Vessel (SOV).

The project is expected to last for approximately 16 weeks and will require 1 additional CTV vessel to be present in the windfarm for this period. However, there should be some expectation of weather delays therefore some contingency should be applied to the planned dates.

The Crew Transfer Vessel (CTV) Manor Victor is contracted for normal service operations will support in the field with crew transfers and additional transport.

The additional work scope and vessel should not cause any impact to local vessels or activities, but normal due care should be taken within the boundary of the windfarm due to increased vessel activity and work on turbines and offshore sub stations.

Seaspan Situla will deploy noise monitoring equipment during installation of the first six piled foundations. Noise monitoring will be conducted using a combination of moored monitoring stations and vessel-based deployment. Prior to each pilling event to be monitored, four moored stations will be deployed on the seabed in a straight transect at distances of 500-750 metres, 1.5km, 3-6km and 8-15km. Each station will have a mounted hydrophone which will sit approximately 2.5 metres above the seabed. The vessel-based deployed hydrophone will be positioned in the middle of the water column. For further information regarding monopile noise monitoring, please see attached East Anglia Three Notice To Mariners 013 /2025. Positions of deployed noise monitoring equipment will be notified via future notice to mariners.

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

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

The inspection works will be centred on a 50m cable corridor.

VESSEL DETAILS The vessels conducting these works will be restricted in their ability to manoeuvre and will display the appropriate lights and shapes.

Other vessels are requested to pass at a safe speed and provide a minimum clearance of 500m (COLREGs Rule 16 & 18) during marine operations.

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

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

Given the different conditions and water depths anticipated at each site.

The inspection works will be centred on a 50m cable corridor.

VESSEL DETAILS The vessels conducting these works will be restricted in their ability to manoeuvre and will display the appropriate lights and shapes.

Other vessels are requested to pass at a safe speed and provide a minimum clearance of 500m (COLREGs Rule 16 & 18) during marine operations.

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

The geophysical survey will include Multibeam Echosounder (MBES)/ Backscatter, Side Scan Sonar (SSS), Magnetometer (MAG), Innomar sub-bottom profilers (SBPs) and an Ultra-short baseline (USBL) acoustic positioning system will be used to calculate the position of underwater targets.

The geophysical survey works will be conducted by the following 3 survey vessels.  “Ocean Endeavour”, “Titan Endeavour”, and “Ocean Researcher” as well as one support vessel “GV Jacoba”. The mobilisation of the first geophysical vessel will start 14th March 2025 and the survey operation will commence from around 1st April 2025. The works are expected to last approximately 180 days, including weather downtime. The exact survey dates are subject to mobilisation time, weather and work progress.

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. 

See detailed map on our bulletin website

Echosounder and clump weight

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

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

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

FLiDAR 1 anchor

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

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

The works will continue over the spring. All works will be continuous, 24 hours a day. Charts of the DBB array area are provided below.

During operations, GRAMPIAN DERWENT 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.

See detailed map on our bulletin website

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

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

Please be advised that the subsea survey carried out in 2020, identified seven cable routes with 10 exposures in total. The below table provides the locations of the identified exposures.

As cable exposure is a known risk at Galloper and across the offshore wind industry, we would remind Mariners of the safety information found on the KIS-ORCA website ‘The risks of fishing near cables and renewable energy structures. To avoid crossing cables when towing equipment follow the cable corridors- locations of the cables can be found on the Galloper awareness charts via KIS-ORCA.

Please be advised that the subsea survey carried out in 2020, identified seven cable routes with 10 exposures in total. The below table provides the locations of the identified exposures.

As cable exposure is a known risk at Galloper and across the offshore wind industry, we would remind Mariners of the safety information found on the KIS-ORCA website ‘The risks of fishing near cables and renewable energy structures. To avoid crossing cables when towing equipment follow the cable corridors- locations of the cables can be found on the Galloper awareness charts via KIS-ORCA.

See detailed map on our bulletin website

See detailed map on our bulletin website

The geotechnical survey works will be conducted by the following 3 survey vessels.  “Connector”, “Geoquip Saentis”, and “Geoquip Seehorn” as well as one support vessel “GV Independent”, starting from 10th February 2025. The works are expected to last approximately 170 days, including weather downtime. The exact survey dates are subject to mobilisation time, weather and work progress.

Hornsea Four does not request any fishing gear to be cleared as the proposed activities intend to work around any fishing gear encountered. If gear is directly obstructing a sample location, Orsted may request gear relocation though this will be avoided where possible.

The contents of this notice are based upon our current understanding of Hornsea Four’s requirements

On the 3rd of June 2023, Fugro deployed a Floating Seawatch LiDAR buoy within the Caledonia Offshore Wind Farm site for the acquisition of Wind and Metocean Data. The buoy is intended to remain in-situ for a minimum period of 24 months.

Mariners are advised to maintain a 500 m clearance from the deployed equipment.  Operations were completed by the Fishing vessel ‘MS Elisabeth’.

The buoy will remain in situ until June 2025, the exact removal date will depend on weather and be determined at a later stage. A separate NtM will be issued for the removal activity.

Details on the Seawatch Wind LiDAR (3.0) Buoys including navigational safety features and mooring layout design are provided in the attached NtM (V10).

The operations will include visual inspections and maintenance at installed WTG foundation locations. During operations, the Edda Boreas 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 Offshore Supply Vessel and pass at reduced speed. Fishing gear or other equipment with seabed intervention should not be deployed when approaching the working area.

See detailed map on our bulletin website

See detailed map on our bulletin website

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.

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