Scales 1:24 and 1:12. An ozatrace copy of a plan showing the elevations 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 5 of 8 and was drawn by R. C. Main [Draughtsman at Portsmouth Dockyard flourishing 1974].