LW, you are informed on that what the passive mode works with bugs?
The passive torpedo do not lose contact - doctrine does not receive never command LOSTTRACK in a passive mode. More correctly to say - torpedo loses contact, but the doctrine does not receive LOSTTRACK message from the engine - because of it of a torpedo emerge on a surface and jumping as dolphin.
When such "surprises" - I become known for me become sad.
Also in an active mode, all time remains switched on the passive gauge.
For example when is started UGST in an active mode, if the purpose moves on the large speed and does a lot of noise, the detecting is real occurs by a passive sensor control, but not active!
Check up it debugger and you will see it.
Have it in a kind at designing new ATC.
Cheers!