Crossword Genius

Echolocation (5)

Ross

I think it could be either:

radar

sonar

(Other definitions for radar that I've seen before include "Locator that uses a microwave echo" , "Kind of gun" , "System for locating distant objects" , "Pulsed location-finder" , "Remote detection device" .)

I've seen this clue in The Mirror and the USA Today.
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