Crossword Genius

Echo sounder (5)

Ross

I believe the answer is:

sonar

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">echo sounder</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for sonar that I've seen before include "Device for detecting objects used in arson" , "Underwater detection device" , "Locating device" , "Undersea sensing system" , "Detection system at sea" .)

I've seen this clue in the Sydney Morning Herald and The Telegraph.
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