how much time is spent submerged or surfaced depends on:
1) what year of war
2) wheather situation
3) range of allied aircraft
when there is bad sight I stay submerged nearly all of the time and surface just shortly to charge the batteries. don't want to run into a hunter-killer-group within a range of 1,200m (as already happened to me).
I prefer the longer range of the hydrophone, too. in good wheather and marching to or from my patrol grid I sail surfaced. in the near of an allied air-base I run submerged most of the time, especially when sight is not good or it's cloudy.
don't know if this approach is historically appropriate but it helps keeping my crew and me alive.
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