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 at the forward pyrotechnic locker between 46 and 47½ stations on the starboard side of 1 deck looking forward and to port into the empty locker. A shelf is labelled for Markers, Marine No. 4. Next to the door are an armaments broadcast (A.S. section) distribution box and a microphone. A vertical format negative.