Scale 1:144 for the longitudinal measurements and 1:192 for the vertical measurements. This mix of scales result in a distorted diagrammatical view of the decks. Plan shows the incident board for No. 01 [superstructure], No. 1 [upper], No. 2 [main], No. 3 [lower] and No. 4 [hold] decks and the inner bottom for the Rothesay class frigate Rhyl (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.