You have to change the sensitivity for each Hydrophone setting inth enemy AI_Sensors.dat. Since there is a value there, it overrides the Sim.cfg.
It is set about .03 IIRC, changes here are interesting. I know someone did along time ago.
You should be able to make the enmey active sonar and passive sonar pick you up from far away. I think you want the Hydrophones to pick you up far away then have it come and investigate.
The DD are rather stupid in this regard. I have to pratically surface to get their attention.
Just to get the DD to be a challenge (they have no decent search pattern) You can make the hydorphone more sensitive, but even more take away the distance penalty, and make the detection time longer.
What this wil do, the DD will know you are there with the higher sensitiviy setting inside the AI_Sensor.dat file if you move at all. So sitting quite at zero speed will allow you to surprise a convoy.
If you move at all, they pick you up, but with aslonger detect time, the chance to get a sold detection takes a few minutes,. Enough time to surface and do your dirty work, but not so long to dive to a safe depth, as they come after you.
If they get within Active sonar range, the can DG you. Another mod lets you get under the active sonar if you are fast enough, maybe that can be changed also for the Hydrophone.
The upshot is to get the DD a chance to search for you after a time. As it is, they are too easy to avoid and get away from.
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