King's Harbour Master Portsmouth

LNTM No 31/22

1. NOTICE IS HEREBY GIVEN by the Queen's Harbour Master Portsmouth that Unmanned Surface Vessel (USV) trials will be conducted in the Stokes Bay in the period between 21 to 25 February 2022. 

2. USV operations will be conducted in daylight only with a safety vessel in attendance throughout. A small USV “C-Worker 74” will be undertaking Sea Acceptance Trials (SATs) in Stokes Bay. "C-Worker 74" is a 7 metre craft and is coloured yellow and has a top speed of 10 knots. "C-Worker 74" will be accompanied by "Valkyrie 6", which will tow the craft to/from Trafalgar Wharf to the operating area and will act as the safety vessel for the sea trial. The trial staff officers embarked in "Valkyrie 6" will intervene in the event of any safety issues. For the trials serials, "C-Worker 74" will be remotely controlled, with the operator following the International Rules for Preventing Collisions at Sea (COLREGS) at all times.

C-Worker 74

Valkyrie 6 

3. Trials will take place from approximately 1000 to 1500 on each day in the Stokes Bay area as shown below. "C-Worker 74" will only be operated in autonomous mode when in the area. The trial staff manning the safety boat will verify that the proposed Sea Acceptance Trial is safe to continue. 

Browndown/Stokes Bay area: 

50°46’.684N 001°09’.463W 
50°46’.362N 001°09’.647W 
50°46’.765N 001°11’.398W 
50°47’.085N 001°11’.196W 

Stokes Bay trials area (Chart not to be used for navigation) 

4. The safety vessel Valkyrie 6 will be listening on VHF Ch 11, Ch 12 and 16. Where possible, trials vessels will maintain a 200-metre separation from other craft, and trial runs will be modified or aborted if a close-quarters situation is developing.  

5. All trials vessels will obey the International Rules for Preventing Collisions at Sea (COLREGS) at all times.  

6. Local Notice to Mariners 27/22 is hereby superseded, cancel this LNTM on 28 February 2022. 

Wednesday 16 Feb 2022

Queen's Harbour Master

Owners, Agents, Charterers, Marinas, Yacht Clubs and Recreational Sailing Organisations should ensure that the contents of this Notice are made known to the masters or persons in charge of their vessels or craft.