RFB swaps out nearly ALL of the sound files for the hydrophones.
I personally have not had any trouble with them and often find distant, un classifiable contacts that my sonar man doesent. As I said before with RFB you can even pick up 'stationary' contacts.
All I can think of is 1.) your not deep enough and still in the surface boundry 2.) Something is wrong with your hydrophone gear or 3.) Your install of RFB is screwed up.
With RFB you cannot pick up contacts while surfaced, none, nada, nothing. Usually going to Periscope depth is enough, but just to make sure I typically go to about 80 feet.
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