Chart comparison unit

From International Dictionary of Marine Aids to Navigation
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An optical device to enable a radar P.P.I. picture to appear superimposed on a navigational chart.

Reference: B.S.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

charge current


Centre of buoyancy


International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM