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Originally Posted by TopCat
I suspected that a "sophisticated" solution to the problem could not be found. However, I'd prefer as it was before (no hydro contacts on surface).
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Yes and no on this. I can sit on the USS Torsk located in Baltimore harbor and hear the props of the water taxi's over the sonar. The submarine is WW2 vintage and the chin sonar a bit more sophisticated then the WW2 original but basically the same. She is afloat and of course engines off. Props can be heard. Perhaps while diesel are on this sonar does not work or is less effective.