From International Dictionary of Marine Aids to Navigation
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Alternative term: Transponder beacon

A component of a secondary radar system which receives pulses from a radar set or interrogator, and, in response to the received pulse, transmits a pulse or sequence of pulses to enable the craft or beacon incorporating the transponder to be identified by the interrogating station.

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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