There are minefields defending most of the German U-boat bases and there are the giant British east coast minefields from 1940 to mid 1944. You can avoid the harbour mines by following the warship escort that leads your U-boat in and out of base. You can avoid the British minefields by not approaching the British east coast or the sea area between Dover and Dunkirk between 1940 and late 1944.
Check the locations of the mines in the documentation and in the pull-down maps in the top left of the screen.
Stiebler.
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