Seagrass monitoring survey and seabed mapping will take place in Dale Bay from 7th through 10th September 2026 by "RV Gwenhidw".

  1. MARINERS ARE HEREBY ADVISED that, diving operations to conduct seagrass surveys and seabed mapping will be undertaken in Dale Bay at position 51°42'17.6"N 005°09'34.9"W from 7th to 10th September 2026 (see below chart with operational area) carried out by ‘Project Seagrass Ltd’. 
  2. Diving operations will be carried out by the vessel ‘’RV Gwenhidw‘’.
  3. “RV Gwenhidw” will display lights and shapes in accordance with COLREGS, Flag A will be displayed whenever divers are in the water. Vessel will remain in contact with Milford Haven VTS and always monitor VHF Ch. 12. 
  4. Mariners are requested to navigate with caution, pass at a safe speed and maintain a safe distance when operating in the area. 
  5. Admiralty Charts 3274, 3275, IMRAY Y26, and 2600 Atlas refer. 
  6. This Notice to Mariners will self-cancel at 23:59 on 11th Sept 2026.