Scale 1:192. Plan shows the monitoring officers incident board on all decks, as fitted on the Tribal class frigate Gurkha (1960). This panel would be on the wall and would light up if an incident (such as fire, flooding or a injury) was reported in a specific location on board. A Thornycroft builder's stamp, dated 30 April 1963 is printed on the drawing. A Thornycroft principal ship overseer's stamp. dated 15 May 1963 is also printed on the plan.