On board the type 81 general purpose frigate HMS Tartar (1960) in Portsmouth Dockyard between November 1973 and April 1974 during a refit. The photographer is in the sonar instrument compartment between 16 and 28 stations on 3 deck looking to starboard and slightly forward from the port side at 21 station showing a sonar type 1072 box junction and relay unit, a telephone handset, a receiver/amplifier power supply unit and sonar cabinet No. 5 against the starboard side of the ship.