I believe they would sail like 90% of the time on the surface, the U-boats where essentially torpedoboats (perhaps even more like destroyers) wich could submerge.
They would only dive to escape from stronger opponents and aircraft, or to attack shipping.
Ingame however I'd cruise to my patroling area at max TC and submerge every 4 hours game time or so to dive and listen to hydrophones, attacking as much as possible.
Oh and remember AOB is the angle at wich the target should see your ship! Not the bearing from your ship!
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