Admiralty Method of Tidal Predictions. Method of finding tidal state at a required position by use of data in Admiralty Tide Tables and in conjunction with form H.D. 289.
Admiralty Pattern Anchor. Older type of anchor in which shank and arms are fixed and stock is at right angles to arms.
Admiralty Sailing Directions. Series of volumes, issued by Hydro-graphic Department of Admiralty, covering all navigable waters of the world. Give all possible information to the navigator concerning navigation in the waters they cover. Often called 'Pilots'.