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Same as RADAR BEACON, RDF BEACON, and RESPONDOR BEACON. A racon is a transpondor used for radar navigation. Radar beacons are divided into several groups: (1) ROOSTER -- An airborne radar beacon which will enable other radar-equipped aircraft to home on it. (2) EUREKA -- A battery-operated lightweight portable radar beacon which may be dropped in a container by parachute. It is interrogated by a Rebecca IR unit. (3) REBECCA -- An airborne interrogator for the Eureka-type beacon. (4) JELLYFISH -- A battery-operated lightweight radar beacon designed to be carried by an aircraft on a bomb rack. It is dropped into the water, moors itself automatically and switches itself on.