If you are talking about active sonar:
German Uboats did not have any during the entire war, exeption a few experimental ones, but those also where quickly stripped of it again since it would reveal the position of the Uboat if used. It is not in the game and you would have to mod it, i don't think there is an existing one.
If your talking anout the "Get Ocean Depth" one, i can't recall the name atm, you can still do it, you can ask your Navigator IIRC about the depth under keel or use the button on the bottom left of the screen, both will send a ping straight down and get the depth this way, but this also reveals your position to the enemy, but i don't know if it is the game.
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