Inter-trace display

From International Dictionary of Marine Aids to Navigation
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A technique for presenting additional information, in the form of alpha-numerics, markers, cursors, etc., on a radar display, by using the intervals between the normal radar presentation scans.

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

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