I always stay surfaced early in the war. Later, you have to be wary of planes. Also I dive in bad weather, just to give my crew a break.
Surfaced by night, submerged by day was the American policy; I don't know about the Germans.
Speeds: Ahead 1/3 going to and from patrols, slow while in your patrol area. Submerged, always slow; otherwise you drain your batteries to quickly.
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