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Acutal use of celestial navigation prior to the GPS era

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It's January in Minnesota, my (current) boat is for sale.  I'm learning celestial navigation, partly as a mental challenge, and partly as a way to understand history.  I find it interesting: the math is easy but the arithmetic is hard.

Reading through some older tutorials and, especially, advice on how to use celestial navigation in practice on a yacht (as opposed to on a commercial or military vessel), it appears to me that actual practice was, well, a little sloppy.

Nominal practice, as...

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