radar beacon

Noun
1. a device that, on receiving radar signals, transmits coded signals in response to help navigators determine their position
(synonym) racon
(hypernym) electronic signal

1. A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the triggering radar, providing range, bearing and identification information. [NTIA] [RR] 2. A receiver-transmitter combination which sends out a coded signal when triggered by the proper type of pulse, enabling determination of range and bearing information by the interrogating station or aircraft. [JP1]

(See RADAR.)