No scale. Plan shows the position wiring diagram for the sonar type 170B on board the Whitby class frigate Whitby (1954). The drawing illustrates the diagram in relation to the sonar control room, operations room and bridge. A Rosyth Dockyard Electrical Engineering Manager's stamp, dated 3 July 1962 is printed on the drawing. This plan was modified at Portsmouth Dockyard in July 1964.