Question is other then for their own ports, did they have accurate depth soundings at that time for most of the globe? I know alot of the atlantic was detail surveyed for depth about 10-20 years after ww2. So im not quite sure if any real details other then a vauge idea was available at the time.
I usualy if im trying to do that is stay as close to the surface as i can with out exposing myself, and try to stay in the middle, that or cruise along the bottom at 1kt. Other options are using your periscope to see whats going on around you (this depends on the mods you use though)
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