It goes beyond torpedoes. Your ship identification book is far more accurate than the ones the actual skippers were supplied with, which often were full of misleading information, educated guesses, and had a lot of the ship's classes wrong, mixed-up or completely missing. For example, the massive battleship Yamato is in your book, although she was nothing more than a rumor to US naval intelligence at the start of the war. It wasn't until a document was captured on Tulagi in August 1942 that the US got their first crude schematic of the design, and for the first time confirmed a barrel-count of nine guns.
But foreknowledge is a problem in any historical simulation. You can't re-fight the battle of Waterloo without knowing how the original battle came out and who did what right and wrong.
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