Crossword Genius

Hydroacoustic device (5)

Ross

I believe the answer is:

sonar

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hydroacoustic device</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for sonar that I've seen before include "Underwater navigation device" , "Underwater detection system" , "Method of echolocation" , "Underwater detector" , "Device for detecting objects under water with sound waves" .)

I've seen this clue in the Newsday.com and the Newsday.
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