New tactic discovered

[U777]

I was near Scapaflow when a I got caught by a destroyer, while charging towards U-494 we lobbed an electric eel and immediately dived to 65 meters after a quick sonar check of the depth. Torpedo detonated prematurely so we had to play the cat and mouse game. After dodging a few attacks I was about 4 meters above the bottom and then an idea hit me; if I know where the destroyer is dropping her charges I can keep the engines off therefore providing ultimate stealth since sonar cant really distinguish between me and the bottom and their hydrophone will be useless. I raised the OBS scope a few meters and every time I hear the screws I tracked where she was going and saw most of the the attacks to be off be a few hundred meters thus avoiding the need for flank speed. About an hour later she departed and we went home.

Anyone tried using the OBS scope to see how the enemy's aim is? (this is done with my newly created realistic career, old one deleted.)