UNCREWED SURFACE VESSEL TRIALS 1 FEBRUARY - 31 DECEMBER 2026

1. NOTICE IS HEREBY GIVEN by the King’s Harbour Master Portsmouth that Uncrewed Surface Vessel (USV) trials will be conducted within the Dockyard Port of Portsmouth over the period 1 February to 31 December 2026.  
 
2. The USV will be trialled in Osbourne Bay, Portchester Lake, Stokes Bay and Roway Wreck.
 
3. The USV will operate in remote/autonomous mode within the trials area, by day and night. Only one USV will be trailed at any given time. The USV will be towed on transit between The Old Camber, Portsmouth and the trials location. 
 
4. The USV ‘MARS’ is a grey monohulled vessel (LOA 4.5m). The USV will be supported by a catamaran ‘VALKYRIE 6’ and/or a RIB ‘HI LIFE’ that will act as the safety and support vessels during the period of the trials. The safety vessels will attend all times of the trials period. 
 
5. The safety vessel will be listening on VHF Ch 11, 12 and 16. 
 
6.  All trials vessels will conform to the International Regulations for Preventing Collisions at Sea (COLREGs) and The Dockyard Port of Portsmouth Order 2005 at all times.  
 
7. Cancel this LNTM 31 December 2026.