radar beacon

noun
  1. a radar device at a fixed location that, on receiving a radar signal, automatically transmits a particular radar signal in reply, identifying itself and enabling navigators of ships and aircraft to determine their distance and direction from it.

Origin of radar beacon

First recorded in 1940–45
Also called racon.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for radar beacon

radar beacon

noun
  1. a device for transmitting a coded radar signal in response to a signal from an aircraft or ship. The coded signal is then used by the navigator to determine his positionAlso called: racon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012