Secondary radar

From International Dictionary of Marine Aids to Navigation
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Radar in which the target is fitted with a transponder (4-3-420) to re-transmit automatically on the same frequency as the interrogating frequency, or a different frequency. The response may be coded or delayed by a known duration (or both) to provide identification, and to allow the range to be measured.

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