Scales 1:12 and 1:1. An ozatrace copy of a plan showing the structure of No. 1 deck between sections 55 and 58 1/4 on the sonar trials ship Matapan (1945). Matapan was originally a Battle class destroyer that was converted into a sonar trials ship in 1971. This drawing is noted as Sheet 5 of 6 and drawn by L. W. Reeves [Draughtsman at Portsmouth Dockyard flourishing 1974].