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 to starboard and slightly aft towards the door. There are two operator's positions. The operator on the left has a combination safe under his desk and a tape recorder and reproducing unit on top of the desk. The operator on the right has an Admiralty pattern FH38 receiver unit with a small screen and on his left is a Receiver CAY No. 3. An Emcon policy notice is fixed to the door.