Depth charts??

[Paulebaer1979]

Originally Posted by Aras

Another thing about realism :

If you use active sonar (depth under keel) while a DD is using passive sonar, they couldn’t pin point your location however there will be aware of your existence. This is not simulated in the game.

A ship near your sub is only able to hear your active-sonar (depth under keel) if it has a passive sonar for the frequence of your active sonar. If not, it can´t find you, because the frequence of the echolot is in frequence which humans can´t hear - dogs perhaps, but they do not sit at an sonar operator desk.