Notices to Mariners Week 30

UKHO Permanent/Temporary/Preliminary

1. ENGLAND – East Coast – NM Block. – One new UKHO block updating Whitstable Harbour.
2. NETHERLANDS – NM Blocks. – Two new UKHO blocks for two charts covering the Wind Farms adjacent to the Thorntonbank.


1. Two on the Crouch – Flagged Buoys off Black Point, River Crouch – Mariners are advised of the existence of small orange flagged buoys marking nets off of Black Point off Bridgemarsh Island. Please keep a good look out when navigating in this area. They do not encroach upon the main Fairway.
Swallowtail No 2 Lighted Buoy, River Crouch – Mariners are advised that Swallowtail No 2 Lighted Buoy in approximate position: 51° 41.184’N 001° 06.296’E is unlit.

2. LOWESTOFT – TRANSITS OF UNMANNED SURFACE VESSEL – CONDUCTING SURVEY OPERATIONS AT GREATER GABBARD OFFSHORE WIND FARM – hydrographic survey operations, at the Greater Gabbard Wind Farm, are scheduled to commence on Saturday 11th July 2020. These will be conducted using an unmanned surface vessel (USV) “X-06”. The vessel is capable of working 24/7. The USV has AIS, Navigation lights and a radar reflector (see below photograph). The duration of the survey work is approximately 4 to 5 days and is subject to favourable weather conditions. The vessels will transit to and from the survey area from the Royal Norfolk and Suffolk Marina in Lowestoft Outer Harbour area. When transiting Harbour areas and approaches the USV will be escorted by safety boat “POSIEDON” or ‘PROTEUS’. The Safety Boat will be monitoring VHF Ch14 during Harbour transits. Please contact Lowestoft Port Control, VHF Ch 14, Tel. 01502 572286, if additional information is required.

3. Approaches to King’s Lynn.UKD “Cherry Sand” Dredging Disposal West Stones Disposal site HU143.BA1200 – from the PMtide 19th July 2020 through until the PM Tide 25th July 2020, UKD Vessel “Cherry Sand” will be carrying out maintenance dredging for the safety of shipping within the enclosed Docks King’s Lynn. Each operational tide the “Cherry Sand” will depart King’s Lynn Docks 1 hour to High water and proceed to the disposal area in the vicinity of the West Stones Beacon (52° 49.7’N 000° 21.1’E). The disposal area is marked by 2 Yellow marker buoys;- SGNW buoy Fl.Y.5s 52°50.615’N 000°21.160’E. SGW buoy Fl.Y.10s 52°50.360’N 000°21.270’E. Discharge will be carried out at approximately High Water followed by return to King’s Lynn Docks about 30 minutes after high water. Mariners are requested to keep clear when the vessel is arriving and departing the Docks and on the disposal area as the vessel will be restricted in its ability to manoeuvre, and to navigate with caution whilst these works are taking place. The “Cherry Sand” will monitor VHF channel 14.

Local NtMs compiled by and reproduced by kind permission of Roger Gaspar, author of Crossing the Thames Estuary