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Originally Posted by Stiebler
As I've pointed out elsewhere, it is exceedingly unwise to rely on information compiled in web-sites. They are mostly put together by semi-knowledgeable enthusiasts who have just uncritically collected as much information, from as many sources, as they can.
Use books, as a substitute for the original information. And make sure that the books draw on original information, and are not just a compilation of other people's books (you need to read the book, for this).
Older British compilations of U-boat ranges clearly use the term 'sea mile', as a substitute for the more modern 'nautical mile'. Since 'sea mile' is usually abbreviated to 'sm', there is clear scope for confusion with 'statute mile'. To the best of my knowledge (as a Britisher), 'statute mile' is only used for land maps, never for use at sea.
I have two central reference works, where the submerged range for the Type VIIB U-boat is stated explicitly as "90 sea-miles at 4 kts".
Stiebler.
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Stiebler. I coudln't agree more about the web sites. The information is diverse.
Your sources seem to be more trustworthy than web sites. I am semi-convinced now about sea / nautical miles, unless someone can prove us otherwise with different valid references. Can you write the name of the books (authors, publishing house etc.)? I would be greatful!
But we have to reach some sort of consensus on which measuring unit we are going to use from now on.
Anyone else on this?