IIRC the idea behind the vagueness of the navmap was to simulate the uncertainty faced by the Uboat commander. They did'nt have accurate knowledge of all the worlds waters and could only be truely sure of the depth under the keel by using the Echolot.
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Sir Humphey Appleby, GCB, KBE, MVO and MA. Britain's Greatest Orator, well bar that Churchill fellow.
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