Scale 1:144 for the longitudinal measurements and 1:96 for the vertical measurements. This mix of scales result in a distorted diagramatical view of the decks. Plan shows the incident board for all decks on the Rothesay class frigate Yarmouth (1959). 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 Yarrow & Co builder's stamp and Admiralty Overseer stamp, both dated 16 December 1960 is printed on the drawing.