Underwater Detection Device Crossword Clue — 5 Letters

One confident answer with explanation of the wordplay

SONAR
Best match
S
O
N
A
R

SONAR (Sound Navigation And Ranging) is the classic underwater detection device that uses sound waves to detect objects beneath the surface. It's a perfect and direct fit for this clue at 5 letters.

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Other possible answers
RADARRadar is a detection device but typically used above water/in air, not underwater — less likely but 5 letters.
LIDARAnother detection technology, but used with light, not typically underwater.
DEPTHAs in depth sounder/finder, but not a standalone device name.

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