The white background on the map should be a clue you don't want to spend a lot of time in those areas. Deffinately not as a transit route. White areas vary in depth from 0-48 feet. It was in water only 60 feet a German Uboat was sunk by its own circle run torpedo off the US E coast.
Water that shallow should only be ventured when there is no other choice and for as short as possible.
Take a stab as playing the Quick Mission "Against All Odds" and you'll gain more appareciation for the problems shallow water presents to subs.
-Pv-
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