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Originally Posted by mauriga
Hi JU_88,
tnx 4 your answer.
I probably didn't speak well my mind.
I agree that the sailing boats don't have/use engines, therefore any sound can't be detected by hydrophone! 
BUT...
why did my sonarman detect them? 
He reported to me, while submerged, ship type (merchant), speed (8knts) and bearing.
I can't explain this last thing. :hmm::hmm::hmm:
BRGD
mau---- |
Just to be honest, I couldn't find the way to avoid that problem, I've removed all the sound nodes from the sail ships, except the wake sound,that's why you can pick them on the hydro, but the sim doesn't take into account the actual sound from the ship to flag them as detected, apparently it uses a speed/distance calculation.
Ref