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Originally Posted by Frederf
My notion that aspect has anything to do with passive sonar detection is strictly based off of experiencial data. I sit at 380' with SR and 0 kts with my beam to the enemy... I'm detected. I load up the same save game and turn so I'm parallel with the convoy... not detected. I understand that isn't conclusive (not like going through the sensor game files like you have) but you can see why I arrived at my notion. All I have is the knowlege I gain and my brain to sort through it, no more no less.
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I've just learned how this works myself so I could be wrong, but I think you're mistaken about the detection method.
You aren't being detected passively.
The way the GAME works, if I understand correctly, is that if you present the escort with a good target for its ACTIVE sensors then it will choose to use those sensors to detect you. In real life, unless an escort was just steaming along pinging away randomly, it would be using passive sensors such as hydrophones and lookouts to look for submarines or evidence of submarines. Upon either hearing or seeing something, (such as hearing the sub or seeing a torpedo wake or periscope, etc) it would switch to active and THEN, if you were within the sonar cone and presenting the right angle, it would detect you.
But in the game, if you just happen to be in the sonar cone and presenting a favorable angle for detection and stay there for however long then the escort will magically know to use its active sensors and find you. In other words, if you would have been detected by active sonar if the escort was using it, then the game decides that that is a great moment to use it.
You aren't being detected passively and then attacked. You're being detected actively because you are in a position that meets the game's criteria for active detection, which causes the AI to magically activate it's sonar find you.
To avoid this, you simply do not position your boat in a way that IF the AI were to be using active sonar it would detect you. That way the AI never says to itself "hey, there's a boat there that I can't hear but if I start pinging I'll get him right away." You can still be detected passively by making too much noise.