True motion display

From International Dictionary of Marine Aids to Navigation
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4-3-135

A display in which own ship's position can appear at any point on the screen. All moving targets appear on the screen with true speeds and directions and all fixed objects as stationary echoes.




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

second

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