The Nibelung was a revolutionary sonar system and I'm not sure how well it works in SH3, but it was mainly used to verify an existing resolution or when the boat had already been detected. The Typ XXI was also able to launch acoustic torpedoes by using the active sonar. BUT active sonar like the Nibelung poses a great danger for you: It gives your presense and even your position away. So try not to overly use it to calculate your resolution or the enemy ASW forces will spoil your day.
Even today submarines don't use active sonar unless the have to.
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