The problem for when DD's detect you at 0 kts, silent running is that the DD's active sonar detection cone is on all the time, even when they aren't actively using sonar. As soon as you wander into a place where you would be detected if the enemy DD decides to ping you, he will automatically decide at that second to turn on his sonar and ping you for no reason.
And there you are, detected by the DD. It's a poor modeling of DD behavior in all versions of SH3/SH4. Treat all DDs as if they are pinging all the time, even if they aren't.
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