Glad to hear it! And absolutely, the recognition manual is not needed. The real skippers generally used the “recognition manuals” (which were more often just lists of ships with ID numbers/letters, not pictures) to identify ships by their identifying number that had been radioed in the distress signal, or from info they obtained from survivors. They generally did not know the target parameters (height, length, tonnage etc) from a book prior to shooting. They matched the target’s course and speed on the surface to figure out the data, and if that wasn’t possible, they simply estimated. Getting very close mitigates the impact of wrong estimates.
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