News

USV survey vessel will review the following 5 locations at Dudgeon windfarm:

• K01
• E05
• H05
• A01
• A04

Date of mobilisation will be the 11th April with the USV entering the Dudgeon field by 12th April.

See detailed map on our bulletin website

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. 

The objective of the scope is to carry out dredging in areas where there are large sandwaves that could impact cable burial operations. There are 60 sandwave locations identified within the export cable route that will be targeted for dredging. The extent of dredge areas varies for each location. The lengths of dredge sections range from between 5m and 50m and the width of the sections is ~20m. The 60 dredge areas are located between KP41 and KP123 of the export cable route. The disposal of dredge material will be within the designated disposal area (HU212) and will be contained within the boundaries of the EA THREE DCO limits. HU212 extends from ~KP56 to ~KP140 along the export cable route.

For more information regarding EA3 Export cable corridor dredging operations, please see attached Notice To Mariners 014/2025.

The Explosive Ordnance Detonation (EOD) of these cUXO will be undertaken by a Remotely Operated Vehicle (ROV) deployed from a dynamically positioned (DP) vessel, which will have limited manoeuvrability when operational. The vessel is expected to mobilise in Great Yarmouth on 28th February 2025 and begin operations on 1st March 2025, with the activities anticipated to last approximately 45 days, allowing for mobilisation, operations, and weather contingencies.

Unmanned vessel X-20 Unmanned along with X-24 as a reserve vessel shall survey around the WTG foundations of SN -S11 and SN-G07

Operations will take place subject to weather and other operational factors from 14th April for approximately 7 days. In addition to the survey area, the USVs will transit to/from the port of Eyemouth or Arbroath. A support vessel will escort the USV from the harbour entrance until open water. The USV will then continue transiting towards the survey site. 

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.

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.

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.

Mariners are advised of coastal marine survey activities off Warebeth (orkney) from 21st to 23rd April 2025. The vessel shall be restricted in her ability to manoeuvre. A remotely operated vehicle will be in use. Keep well clear of the vessel while under survey operations.

VESSEL

MPC Athenia – survey workboat (waterjet drive catamaran) Please be aware that the vessel, Athenia, will be restricted in her ability to maneuver as defined under COLREGS (International Regulations for Preventing Collisions at Sea 1972). Masters of vessel are therefore requested to maintain their vessels at a minimum safe passing distance of 1000m

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 survey vessel Marshall Art will mobilise from the port of Middlesborough to the survey trials area on the 22nd of April 2025.  Survey trials are conducted during daylight and night-time hours and in favourable weather and sea state conditions. The Marshall Art will remain on site throughout the operation, unless forced to return to shore by adverse weather.

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

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

A number of confirmed unexploded ordnance items have been located in the vicinity of the charted ammunitions dumping ground to the East of the Isle of May. 

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.

RWE Renewables UK Wind Ltd at Rampion windfarm would like to inform mariners that we are carrying out essential survey work on the seabed within the wind farm.

This work is due to take place between the 26/03/2025 and 26/04/2025 within the Rampion OWF Area, depending on weather.

The works involves; MBES inspection on 15 WTG locations and 4 export cables. There will also be Side Scan Sonar (Towfish) inspections on all array cables (complete length)

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” commenced operations on 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.

A scheduled service from an assigned pool of Platform Supply Vessels providing supplies to the Offshore Converter Platform & JUV Seafox 2 until further notice.  Those nominated vessels are:

• Dina Merkur;
• Dina Scout;
• Dina Supporter;
• Dina Supplier;
• FS Crathes;
• Bos Pool;
• Bos Base

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 on the Sofia OWF.

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

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.

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.

*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%.

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” commenced operations within the Sofia OWF.

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

Mariners are advised to provide a wide berth of these locations. 

A remedy plan is currently being worked on to support the reinstatement of the unlit buoys.

The Horizon Geodrill has temporarily abandoned a USBL Beacon. The Beacon is positioned 1m off the seabed at  53°54'29.868"N 005°21'01.223"

The installed monopiles are 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.

A Statutory Safety zone of 50m radius is in place around the installed monopiles.  The safety zones are 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

Geophysical Surveying

Geophysical surveys will be carried out at various locations within Dogger Bank C Construction site using remotely piloted uncrewed surface vessels (USVs). The USVs will be mobilised from a mothership ILV Granuaile which will deploy the USV’s using a launch & recovery system (LARS). The ILV Granuaile will remain outside the construction site, with the USVs transiting from the mothership to the survey site. There are a total of six USVs, any of which may be deployed to carry out 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 works continuing until May 2025 when all locations have been surveyed. The works will be continuous, 24 hours a day.. It is requested that all vessels maintain a minimum of 500m separation distance from the USVs and from the ILV Granuaile during launch and recovery operationsand pass at reduced speed.

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%.

UXO Clearance Works involving the vessels; DSV Curtis Marshall, Workboat GPS Battler and Support Craft Hughes Hunter will recommence within the EA3 Export Cable Route at the following specific locations:-

UXO Clearances will be carried out utilising a Low Order Disposal technique on 2 x cUXOs.

Diving operations will be carried from the DSV Curtis Marshall which will be operating in 4-point mooring mode. 

The Workboat GPS Battler will be supporting the DSV Curtis Marshall with Anchor deployments and recovery’s.

The Support Craft Hughes Hunter will be supporting operations.

Diving operations will be carried out during day shift slack water periods. Vessels will remain on stanby on site during the night. 

All vessels are required to maintain a minimum of 500 metres safety distance from “DSV Curtis Marshall” making minimal wash and navigating with caution.

The vessel will broadcast relevant sécurité messages and maintain a listening watch on VHF channel 16. 

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.

Monopile foundation installation works

Installation vessel HLV Seaway Strashnov will return to Dogger Bank B this week to complete the installation of the remaining two monopiles. A chart of the DBB construction area and a running list of the installed foundations and next locations are presented provided below.

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.

Dogger Bank B IAC Cable Installation - Termination and Testing and MBES Operations

The SOV Grampian Derwent will continue with IAC Termination and Testing works. The SOVs Grampian Tweed and Wind Evolution will carry out construction support activities at various locations in the DBB construction site

The construction vessels will transmit an Automatic Identification System (AIS) message. It is requested that all vessels maintain a minimum of 1.5Nm separation distance from the vessels and pass at reduced speed. Fishing gear or other equipment with seabed intervention should not be deployed when approaching the working corridor

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

Construction Support Activities

The Offshore Construction Support Vessels Boreas Enabler,  IWS Skywalker, IWS Starwalker, Grampian Tees and Grampian Tyne will carry out construction support activities within Dogger Bank A construction site.

Wind Turbine Generator (WTG) Installation

The Jack-up WTG Installation Vessel, Voltaire, will install wind turbine generators (WTG) within the Dogger Bank A construction area. the Voltaire has completed scheduled maintenance and has returned to WTG Installation operations.

The works commenced on the 18th of July 2023, continuing until approximately Q4 2025.  The works will be continuous, 24 hours a day.  A running list of the completed WTG installations and the next locations to be installed is presented in the Installation progress table in the WNoO.

WTG Seabed Rock Installation

The Pipe Burying Vessel Adhemar de Saint-Venant will perform seabed rock installation at WTG locations in the Offshore Windfarm Array Area.

During operations, the Adhemar de Saint-Venant 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. 

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.

Please be advised that Briggs Marine Contractors (on behalf of SHEPD) will be undertaking route surveys to two proposed subsea cable routes in Loch Linnhe, situated within the corridor identified in the attached Notice to Mariners (NtM). 

This work will utilise the vessel Mersey Guardian, which is detailed overleaf.

Survey campaign operations are expected to commence around 22nd April and are expected to continue for 14 days.

Work Description

Survey operations will use the Mersey Guardian vessel. The vessel will acquire data from survey line plans around the proposed cable routes.

An additional larger operational area around the survey area will be utilised for vessel manoeuvring.

Survey work will be undertaken on a 12-hour daytime basis. During operations, the vessel will be restricted in its ability to manoeuvre.

Should any vessel wish to come within 250m of a survey vessel, then direct communication with the Master is required.

The vessel will display the appropriate lights / shapes for their operations.

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.

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)

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.

Ref: NtM_EGL2_O4_002_20250325

The marine survey activities for EGL 2 are due to commence on 04th of April 2025, the area is shown below in Figure 1. 

The survey is estimated to take approximately 1 day, finishing on approximately the 18th of April 2025, subject to weather.

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 mooring system consists of a 15 m rubber cord, a 60 mm polypropylene rope, two floats, another 80 m of polypropylene rope attached to bottom chains (see Figure 2). Marine users should maintain a recommended 500 metre safe clearance distance from the buffer area shown in Figure 1 due to the risk of snagging or propellor fouling. Updates will be issued via a revised Notice to Mariners when available.

UPDATE: The Green Isle will be mobilised on 12th April (weather permitting) to recover the mooring system. Further updates will be issued via a revised Notice to Mariners when available. 

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.

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 from the vessel Gargano. 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.   

Adhemar de Saint-Venant will start operations on 12th of April 2025 and will perform rock placement during multiple loadouts, finishing her scope around 10th of May 2025. Work will be continuous, 24 hours a day. Coordinates of the DBA array area is presented in Table 1 below. During operations, Adhemar de Saint-Venant 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 Adhemar de Saint-Venant and pass at reduced speed.

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.

Weather Buoy maintenance to be carried out by the vessel ‘Isle of Jura’

Seaspan Situla have deployed eight 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 a 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.

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

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' and provide safety broadcasts where appropriate.

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

The geophysical survey will be conducted as 3 discrete packages with the vessel movong between the areas where required:

• Dogger Bank South East (DBSE) 

• Dogger Bank South West (DBSW) 

• Dogger Bank South Artificial Nesting Structures (ANS)

The survey vessel will be utlising the DBS Eastern ECR for the launch and recovery of the geophysical survey equipment (coordinates outlined below.  The vessel will initially deploy equipment in this area between Monday 31st March and April 2nd April. Thereafter the corridor will be used intermittently throughout the duration of the project for period of approximately 18hrs at a time.

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 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. 

Lifting operations at Wind Turbine Generator (WTGs), WTG D05, WTG E04, WTG G03 and WTG C06 will undertaken within the HGOWF boundary with positions of those WTGs outlined in the table below.

Mariners are requested to observe a safe working distance of 500m when the JV Wind Pioneer is attached or anchored next to those specified WTGs, as well as when manoeuvring into position for the safety of all sea users operating within the wind farm, and to ensure JV Wind Pioneer can safely position itself without negative interactions with sea users or their equipment. 

In order to minimise the risk of negative interactions, fishing gear, markers and anchors should also observe this safe working distance of 500m around WTGs D05, E04, G04 and C06, where works are planned to occur. 

The JV Wind Pionner will be under tow by tug (Dian Kingdom) to the wind farm boundary and will accompanied by the following windfarm support vessels 'Windcat 31', 'Windcat 33' and 'Windact 1'. 

The JV Wind Pioneer is a four legged non-self propelled jack up vessel and is restricted in its ability to manoeuvre. 

The JV Wind Pioneer will utilise and entry and exit route for Humber Gateway at the following positiom: 53°38.685'N 000°19.932'E. In order to minimise the risk of damage to fishing gear, it is advised that static fishing gear remains clear of the entry and exit route and within close ranges of the works areas.  Support Vessels will support the JV Wind Pioneer to identify areas of fishing gear and to avoid gear where possible. If fishers have gear within this entry and exit route or within close range of the works areas, they can share coordinates of gear locations with Control Room or site vessels.

Mariners can contact all vessels working on site through VHF CH16. 

The scope of work for the “DSV Curtis Marshall” comprises of surface fed diving to conduct disposal of two confirmed unexploded ordnance. Whilst diving operations are underway, the vessel will display an alpha flag and make appropriate VHF announcements prior to commencing operations. The “DSV Curtis Marshall” will be assisted by the “GPS Battler” workboat during mooring operations, with the “Hughes Hunter” Providing support during clearance operations.

The “DSV Curtis Marshall” will be working in 4-point mooring mode.

Whilst diving operations are underway, ‘DSV Curtis Marshall’ will display an alpha flag, broadcast relevant sécurité messages and will transmit an Automatic Identification System (AIS) message. All three Vessels will maintain a listening watch on VHF Channel 16 and VHF DSC Channel 70 continuously throughout operations. Diving Operations will be conducted during daylight hours and are dependent on tides.

For Further information regarding ECR UXO clearance operations, please see attached East Anglia Three Notice To Mariners 015/2025.

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 2 week offshore geotechnical survey between 04th and 29th May 2025 using the vessel Connector call sign: OYOJ2. The survey vessel shall be conducting deep-push piezocone penetrometer tests at various locations within the proposed offshore wind farm area and some vibrocores within the export cable corridor. The vessel will typically spend approximately 1 hour static at each test location within the area so please allow a safe distance.

Company:  Outer Dowsing Offshore Wind

Contractor:  Geo

Survey Vessel: Connector

Survey Vessel call sign: OYOJ2

Earliest Start date: 04th May 2025

Latest Finish date: 29th May 2025

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.

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)

Maintenance activities will include but not be limited to:

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

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

The 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.

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.

To provide the required coverage, approximately 16 guard vessels will be used in the period from the 19th of March 2024 until the 30th of November 2024. Durations at each location will depend on progress of the cable installation, trenching and rock placement operations. Not all the vessels are expected to be used concurrently.

The primary purpose of the guard vessels is to protect the exposed cable along the Dogger Bank C Export Cable corridor by monitoring and issuing warnings to marine traffic operating within 6Nm of the construction area with a Closest Point of Approach (CPA) < 1.5Nm. More specifically, the focus will be on those vessels with potential to be engaging in bottom contact activities such as fishing and anchoring, as these activities pose a risk not only to the exposed cable bundle but also to the vessels themselves.

The guard vessels will be clearly marked and display a highly visible "GUARD" sign on each side. The vessels will operate 24hrs, in all but extreme weather. Exchange of vessels on site will ensure the relevant section of cable is never left unguarded.

In sections where cable protection has been completed, guard vessels will be released, and sections will be opened up for fishing or use of other of equipment with seabed intervention. This may not necessarily be in a sequential order from shoreside outwards.

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.

The first vessels are expected to mobilise on 24th March from both Great Yarmouth and Tilbury. The works will take approximately 30 days to complete, not including mobilisation/demobilisation time and weather contingency.

The contents of this notice are based upon our current understanding of Hornsea Three’s requirements.  Any amendents to the information contained within this notice will be communicated accordingly.

Please be advised that Aspect Land & Hydrographic Surveys Ltd (on behalf of SHEPD) will be undertaking subsea inspections of several cables in the Clyde 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, defined by the start and end coordinates listed in Table 1 of the attached NtM.

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 of several cables across the Clyde 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 of several cables across the West Highlands and Argyll marine areas.

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

LOCATION DETAILS

Cable location and indicative survey corridors are 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 this NtM.

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.

Completion of service on 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.

For further information regarding PAM station locations, please see attached East Anglia Three Notice To Mariners 0010- 2025.

See detailed map on our bulletin website

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.

Route clearance of out of service cables, boulders and debris will be performed between KP4 -KP148 of the East Anglia Three Export Cable Route. 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.

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

The geophysical survey vessel, Geo Ranger is expected to arrive in the survey arera on or around the 19th of February with operations expected to continue until the end of April 25. The vessel shall deploy towed survey equipment, mariners are requested to provide Geo Ranger with at least 1000m clearance during survey operations. The fishing vessel Solstice will conduct static fishing gear scouting in relevant survey boundary areas.

The survey will utilise a work class ROV deployed from a dynamically positioned (DP) vessel to investigate discrete areas of the seabed, both in the array and on the export cable route. The vessel is expected to mobilise in Rotterdam on 26th February 2025 and begin survey works on 1st March 2025, with operations anticipated to last approximately 60 days, allowing for mobilisation, survey operations, and weather contingencies.

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

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

Mariners are advised that Partrac, on behalf of The Crown Estate, is planning scheduled servicing of the array of Metocean equipment deployed within three Project Development Areas (PDAs) located off the coast of Wales and Southwest England (Table 1, Figure 1 to Figure 3). The equipment (including three floating LiDAR buoys) was deployed between 09th and 10th May 2024. The equipment will remain deployed for a period of at least 6-months after the servicing is complete.

Partrac plans to conduct service works on the following moorings:

• PDA1, Site 1A: Floating LiDAR

Additional works maybe undertaken at the Metocean array at:

• PDA2, Site 3A
• PDA3, Site 4A

The maintenance is due to take place at PDA1, Site 1A: Floating LiDAR on Friday 13th December 2024, over an estimated period of 1 day, weather permitting, with Briggs Marine Vessel, Cameron, call sign MYEK6.

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.

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. Further installation works will proceed from spring 2025. The exclusion area remains in force at all times. 

More information about the Princess Elisabeth Island is available on the Elia website: www.elia.be/projects. 

See detailed map on our bulletin website

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

See detailed map on our bulletin website

See detailed map on our bulletin website