
1) Electronic signal 2) Lighthouse marker 3) Radar beacon 4) Radar transmitter
Found on
https://www.crosswordclues.com/clue/racon

A racon is a radar transponder commonly used to mark maritime navigational hazards. The word is a portmanteau of RAdar and beaCON. When a racon receives a radar pulse, it responds with a signal on the same frequency which puts an image on the radar display. This takes the form of a short line of dots and dashes forming a Morse character radiating ...
Found on
http://en.wikipedia.org/wiki/Racon

abbreviation: Radar Beacon
Found on
http://www.encyclo.co.uk/local/20021

Radar beacon which, when triggered by a ship's radar signal, transmits a reply which provides the ra
Found on
https://www.encyclo.co.uk/local/22373
No exact match found.