Shah_Deu
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Yeah we know what acoustic signature is. But you dont need an acoustic signature to track something that is on surface.
Next time when you fly to dubai, take a window seat and dont forget to take some photos of ships in the sea when the jet is descending or circling the city for landing. No need to throw away $200 million for that, try using your $300 mobile camera. Should work just as fine. Thank me later!