Scale 1:12. An ozatrace copy of a plan showing the layout and overhead plan of the upper sonar cabinet space 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 4 of 8 and drawn by R. C. Main [Draughtsman at Portsmouth Dockyard flourishing 1974].