Notices to Mariners Week 18

Notices to Mariners Week 18 – Notices to Mariners for the Southern East Coast of the UK and across to France, Belgium and part of Holland

UKHO Permanent/Preliminary/Temporary

1. ENGLAND – East Coast – Depths. – Two reduced depths in the Lower Hope and Gravesend Reach of the River Thames. Both in excess of 6+m.
2. ENGLAND – East Coast – Lights. Fog signals. Wind turbine. – There are lights removed from the turbines on the Gallopher and Inner Gabbard parts of the Greater Gabbard Wind Farm in consequence of the eastern extension of those two parts of the Wind Farm. The lights had been on those turbines because they were SPS – Significant Peripheral Structures. Now they are no longer on the ‘edge’ of the wind farms they have been removed. NOTE: in week 15, there were UKHO blocks showing the new SPS lighting. See page: for downloading the blocks.
3. ENGLAND – East Coast – Buoyage. – This is a repeat of NtM 1847 in week 15 changing the marks on Holbeach Firing Range in the Wash.
4. ENGLAND – East Coast – Depths. – One reduced depth on the south edge of the Yantlet Channel east of the pair of Sea Reach No 3. At 13.4m of course leisure craft will not be hindered. The image includes two other reduced depths report vide NtM 1797 in week 15.
5. ENGLAND – East Coast – NM Blocks. – A new UKHO block for part of the River Thames at Northfleet Hope and the entrance to Tilbury Docks.


1. NATIVE OYSTER RESTORATION WORKS – COMMENCEMENT OF ACTIVITIES – WEST MERSEA – Starting on 29th April 2019 works will commence on the Essex native oyster restoration project within a defined restoration box, of which the north-west corner is located approximately 500m offshore to the south-east of West Mersea (hereafter referred to as the ‘Restoration Box’). The Restoration Box is approximately 2000m (west to east) by 1000m (north to south). The works will include the deployment of shell and stone onto the seabed in six locations (approximately 10m x 20m, and 30cm in height) in the south-west corner of the Restoration Box (approximately 500m x 700m area). The works will be carried out from the Dredger Earn (80ft x 21ft) and Tug Edgar (40ft) and are expected to be concluded before week commencing 13th May 2019 subject to satisfactory weather conditions. During the works, mariners are requested to keep clear and avoid any unnecessary wash. On completion of the works, the deposited shell and stone will remain permanently in place on the seabed. Mariners are therefore requested to be mindful of the raised seabed in this location. Other activities to take place include deposition of spat collectors (to be the subject of a separate Notice to Mariners) and restoration management. These activities will take place in June, July and August 2019 (exact dates to be confirmed). Restoration management will take place from a dredging (fishing) vessel. Image at the same page but on the Temporary List.
2. NORTHFLEET HOPE HALLS NORTHFLEET JETTY CONVEYOR WORKS – Works are due to commence the week beginning 22nd April 2019 at Halls Northfleet Jetty. The works, which are expected to last until late June, will consist of:  removal of the dredged material pipeline,  installation of a new conveyor system including piling  demolition of downstream derelict conveyor  installation of new two new monopoles and associated fenders. All works will be undertaken from a ‘Ravenstein’ spud leg barge (24m x 17m) with the assistance of the tug, HORTON. An additional safety boat will also be in attendance. All vessels will maintain a listening watch on VHF Channel 68. When works are underway a ‘Proceed with Caution’ will be broadcasted by London VTS on VHF Channel 68.
3. GRAVESEND REACH TILBURY2 MARSH FARM JETTY AND MOORING DOLPHIN REMOVAL – Notice to Mariners L14 of 2019 referencing the above works at Tilbury2, have been cancelled, and will be rescheduled at a later date. PLA apologise for any inconvenience caused.
4. Harwich Harbour Maintenance dredging – Harwich Haven berths and approaches – on or about the 23rd April 2019 the plough dredger TEDDY will commence maintenance dredging of the Harwich Haven berths and approaches for approximately 15 days. On or about the 25th April 2019 the trailer suction dredger HAM 316 will commence maintenance dredging of the Harwich Haven berths and approaches for approximately 10 days. Survey work in regard to the dredging operations will be conducted by the survey/crew vessel Havlik, due to commence work from 18th April 2019. Material from these areas will be disposed to the new Harwich Haven disposal site. Detailed dredger movements can be obtained from Harwich VTS on VHF Channel 71.
Lights and shapes as required by Collision Regulations will be exhibited and a listening watch on VHF Channel 71 will be maintained throughout.
5. Ipswich Temporary Lock Closure Saturday 11th May 2019 – will be closed for all vessels during the following periods:- Saturday 11th May 2019 1350 ~ 1635hrs Saturday 11th May 2019 1735 ~ 1940hrs These closures are required to accommodate the prestigious 5k Twilight Road Race which is taking place around the Wet Dock. Please schedule your trips accordingly on this day to take into account these Lock Closures.
6. Port of Ramsgate – DREDGING CAMPAIGN – the Grab Dredger ‘Mannin’ will be undertaking a dredging campaign within the Port of Ramsgate, commencing the 25th April 2019 over a period of 3 weeks. The dredger will be monitoring Channel 14 and vessels are requested to pass at low speed.
7. RAMSGATE NO. 6 BUOY -No.6 buoy is currently showing incorrect flash rate. Rectification works are presently underway.
8. London Array Wind Farm – Safe distances within the Offshore Wind farm:

• A 50m radius advisory caution zone is established around each wind turbine and offshore substation platform. • A long term 500-meter exclusion zone has been implemented around D20 – (51° 38.024’N 01° 24.612’E) as a precaution until further notice due to a damaged blade. [Not close to Foulger’s Gat] • A short term 500-meter exclusion zone has been implemented around C17 – (51° 37.132’N 01° 25.641’E) this location stands in the Foulgers Gat channel and a wide approach is requested. • The MPI Adventure will move from WTG to WTG, spending approximately 36-48 hours at each location. When located at a WTG, a 500-meter exclusion zone will be put in place centered on the MPI Adventure. • Short term 200-meter exclusion zones will be in place at various locations while MPI Dulcinea is carrying out rope access works. • The Bokabarge 82 will move from WTG to WTG carrying out cable maintenance works. Whilst operational, and in transit, a 750-meter exclusion zone will be put in place centered on the Bokabarge 82.

Information on SW Sunk swatch shortly.

Link to details –

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


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