The main role wind and current played in the Battle of the Atlantic was in navigation. Strong winds and swells/currents could throw nav calculations off by significant amounts especially if there was no possibility of a sun/star shot to caclulate positions.
IIRC Das Boot mentions this.
Given the fact that our uboats appear to be blessed with GPS forty years before it was developed, we don't have the problem unless you want to play in uber reality mode and use a paper chart to calculate where you are and never hit F5.
