Yes I have. Whenever you get blow five knots then the detection circle shrinks quite a bit. It's just ridiculous to think that a destroyer could hear a submarine on the surface from 4.3 km away running Ahead slow at 7 knots.
Only when I tweaked the value under hydrophones can I adjust this . Working with the perimeter called "noise factor" I raise it and it seems to make the detection circle smaller but I have to experiment to see how it affects the underwater sonar ranges
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