Welcome to Subsim, Dietrickvonfikt.
In 1943, operational U-boats had not been fitted with the schnorchel. The very first schnorchel-fitted patrols did not begin until about March 1944.
Thus it has been very important to discover how long U-boats could travel underwater before the schnorchel was fitted, if SH3 is to be played correctly. Standing orders during 1943 were to surface once per night to recharge the batteries. (Actually, the standing orders changed several times during 1943, but this was the most persistent order.) Since recharging required 2-4 hours, the air-containers were also refilled (several minutes only) at the same time.
I hope that makes clear any misunderstanding.
Stiebler.
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