Target trail

From International Dictionary of Marine Aids to Navigation
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Target tail

The display of diminishing luminance seen to follow a target on a P.P.I. which results from afterglow and the progress of the target between successive scans of the radar.

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

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