RN BATHYMETRIC SURVEY WORKS

1. NOTICE IS HEREBY GIVEN by the King’s Harbour Master Portsmouth that RN Survey vessel VIDAL will commence Bathymetric survey works within Portsmouth Harbour and the Main Approach Channel from 28 April with work expected to continue until end July 2025.

2. Initially areas being surveyed by ‘VIDAL’ (LOA 11.2m) are the Main Approach Channel and the Inner Harbour as far north as the turning circle, subsequently work will continue in the creeks, Spithead Anchorages and other locations as required which may involve additional observations, all works being conducted during day light hours (weather dependent) only.  

3. The vessels will maintain a listening watch on VHF Channel 11 during operations and display appropriate shapes (Ball-Diamond-Ball in a vertical line) or lights (Red-White-Red in a vertical line) when operational.

4. Mariners are requested to keep well clear of the vessel while surveying and to liaise early with the vessel, if in any doubt, as to its intentions.

5. Cancel this LNTM 31 July 2025.