The best you can do is take a snapshot of the Mission Editor.
IRL both sides extensively mined each others waterways and channels. The safe routes around the UK were less than a km across and had to be constantly swept to keep them safe. Even then there were numerous losses, and the Luftwaffe used to regularly mine inside the 'safe' routes.
A u-boat captain had little to no idea where enemy and friendly mines were once he left base and he had to work on educated guesses. There was a programme on TV not long ago where three u-boat wrecks were discovered within a couple of km of each other - they all fell victim to a new UK minefield within a couple of days.
I have a ME snapshot that shows the whole of the UK with mined areas - it's enough to give me a general feel for where mines are, but not enough to do any detailed planning. Bear in mind that minefield density is important and that minefields were laid at varying depths - the UK minefields were designed to sink surface ships but there were still mines below keel level (15-20m) within the safe lanes that were designed to sink u-boats.
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