Plan position indicator

From International Dictionary of Marine Aids to Navigation
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Alternative term: P.P.I. display

An intensity-modulated radar display in which a radial scan rotates on the cathode ray tube in synchronism with the rotating antenna.

The display indicates, as on a map, the positions of echo-producing objects, and is generally one of two main types, relative display or true motion display.

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

charge current


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