On board the Type 12 general purpose frigate Plymouth (1959) alongside the south side of number 3 basin in Chatham Dockyard at the end of a modernization which commenced in August 1966. The ship is berthed starboard side to the quay. The photographer is in the operations room between 31½ and 35½ stations on 1 deck looking to starboard showing an Admiralty Research Laboratory plotting table and console with an interphone control box under the deckhead. On the left is an indicator azimuth range track visual display unit.