Crossword Genius

Navigation aid (5)

Ross

I think it could be either:

radar

sonar

'navigation aid' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for radar that I've seen before include "Method of detection" , "Equipment for locating objects" , "Locator that uses a microwave echo" , "Radio device for tracking distant objects" , "System for detecting things using radio waves" .)

I've seen this clue in The Mirror, the Sydney Morning Herald and the Universal.
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