I'll use a sub's active sonar in two situations. First, if I'm hunting a Kilo--active detection range is greater than passive against a Kilo, and it is often greater than the maximum range of the Klub-ASW's. Yeah, I know, not very sporting, but it's something I started doing to counter the Kilo BB cheat.) The other situation is when I know my opponent has already detected me and probably has a solution. In that situation, a ping from me only evens the score.
In my experience, though, many people who use active sonar tend to use it too often. There have been many cases where I didn't have a good solution on my opponent but it firmed up real quick when they started pinging away.
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