Crossword Genius

Naval acronym (5)

Ross

I believe the answer is:

sonar

'naval acronym' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for sonar that I've seen before include "Echo-sounding equipment" , "Locating device" , "Echo-location system" , "Underwater navigation device" , "Method of echolocation" .)

I've seen this clue in The New York Times.
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