I would resist any passive only TMA for the reason that it just wasn't done in WWII. I've set up a practice mission and tried it out. It works, but is just so time consuming and multi-stepped that error is almost inevitable in the game. With a fast-moving target forget it.
So you won't see me handing out passive only TMA techniques on Subsim. That being said, I use passive all the time to fire torpedoes when the target course and speed is already determined, and by superimposing the bearing on the target track I can derive the exact position. If I'm working with position keeper on, I can compare actual with projected bearing to detect target course changes.
That way I can use visual, radar, active sonar and passive sonar techniques any way I want to mix up a lethal brew of Frankenstein targeting. Usually I'm using all that with a constant bearing attack to mitigate any range errors and make setup something I can do half an hour before I shoot. I hate working under pressure. People get hurt that way.....
I'm still looking for the incorrect information......... I can't seem to find it. Did someone actually utter a falsity? I just can't find a consequential misstatement, much less a "lotta."