Planning here's a good tip
Contact the makers of the admiralty charts you will find what they release to you is very shocking, when i worked at sea i had detailed charts of Faslane Porstmouth and Devenport all are used by the RN and Commercial traffic, you can even buy charts of Norfolk harbour Virginia home to the carriers, Kings Bay Georgia all are even today commercially available.
So its likely Prien and the rest of the mob would have had these charts because even back in the early 1900's the were sold commercially all you needed was a shell company based no where near Germany like say Brazil and go through it that way.
Prien would have known the depth tides the lot so he would have gone ahead with at least half an idea.
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