Don't forget however, that Hitler's U-Boats had access to the sailing instructions, patrol reports and chart corrections from four years of intense inshore warfare from 1914-18. I could not find a single incident in WW2 where a u-boat that had a solid position fix ran aground in British waters, which indicates that the boats operating in UK coastal waters probably did have reliable depth information.
Since the in-game charts do not provide this info, using the pinger to get an accurate depth under keel is not really so gamey as it might appear.
Just $0.02.
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