Hi Guys,
I completed a patrol tonight and got both a new sub (VII C) and some promotion points. I gave it a try and gave the navigator some intensive training.
Now I am able to hold the depth at 150 m at slow speed without problems. Couldnīt check any deeper, since I am still in the north sea on my way to the western approaches, but the problem of sinking to death seems to be fixed now.
Donīt know if itīs the new boat or the navigatorīs skills, but finally Iīm able to sneak away deep and slow.