Pre-1943: 25 meters ahead slow.
Current campaign, Sept. 1944 in a XXI: I mostly stay surfaced and let the radar detector do its work for warning me of enemies, and the radar for spotting lone merchants/patrols with no radar.
Sometimes the waves are so big that the XXI is having problems staying surfaced without constantly switching back and forth from diesel/electric engines, and then I dive. This even when visibility is good. The battery bug of the XXI makes it tedious to keep ordering 'standard propulsion' constantly.
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