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 aft and to port from 34 station on the centreline showing the navigator's chart table with the type 765 echo sounder recorder, amplifier and power units above on the right. Bookshelves containing a large number of Pilot manuals are against the aft bulkhead. A junction box is in the right foreground.