King's Harbour Master Portsmouth

LNTM No 60/22

1. NOTICE IS HEREBY GIVEN by the Queen's Harbour Master Portsmouth that an Unmanned Surface Vessel (USV) Hydrographic demonstration will be conducted in the Solent Areas during the period 13-24 June 2022.

2.  USV operations will be conducted in daylight only with a safety vessel in attendance throughout. A small USV “C-Worker 5” will be undertaking a customer hydrographic demonstration. C-Worker 5 is a 5.5 metre craft, is coloured yellow and has a top speed of 8 knots. C-Worker 5 will be accompanied by Valkyrie 6, which will tow the craft from/to Trafalgar Wharf to the operating areas and will act as the safety vessel for the demonstration.  The staff operators embarked in Valkyrie 6 will intervene in the event of any safety issues. For the demonstration serials, C-Worker 5 will be remotely/autonomously controlled, with the operators following the International Rules for Preventing Collisions at Sea (COLREGS) at all times.

C-Worker 5

Valkyrie 6

3. The demonstrations will take place from approximately 1000 to 1500 on each day in the Solent areas, off Browndown and North Sturbridge as shown below. C-Worker 5 will be operated in remote/ autonomous mode only when in the area. For transit to and from the demonstration area C-Worker 5 will be taken under tow by Valkyrie 6. The trial staff manning the safety boat have verified that the proposed demonstration is safe to continue.

Browndown operating area (Chart not to be used for navigation)

1. 50° 46.741' N - 001° 10.358' W
2. 50° 46.443' N - 001° 10.504' W
3. 50° 46.639' N - 001° 11.323' W
4. 50° 46.934' N - 001° 11.151' W


North Sturbridge operating area (Chart not to be used for navigation)

1. 50°45.436 N 001°9.314 W
2. 50°44.845 N 001°9.865 W
3. 50°44.217 N 001°7.580 W
4. 50°44.987 N 001°7.163 W 

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. Cancel this LNTM on 26 June 2022.


Tuesday 07 Jun 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.