A 2¾ x 2¼ film negative. On board the Type 12 frigate Yarmouth (1959) alongside the South-West Wall in Portsmouth Dockyard. Inside the Electronic Warfare Office on the centreline on 1 deck between 35½ and 38 stations looking aft and to port from near the door. There are two operator's positions. The operator on the left has an Admiralty pattern FH38 receiver unit with a small display screen and the operator on the right has an amplifier and display unit with a small screen. A wooden cupboard with drawers is between the two operators.