I ve just found the falue of "noise factor" in "Hydrophone" section of
sim.cfg file. I change it into stock value and result are quite good. The range of the sensor change accordingly to speed value.
Still have the problem, why DDs have passive sonar circle active when I am surfaced. In stock game there is no such situation. Moreover even I am on surface, the DDs could hear me
, so I can not attack at night at all. So which value is responsible for that ????