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Re: Celestial Nevigation - Book recommendations sought
IIRC the introduction in Blewitt says right up front that it is designed for a lifeboat, i.e. here's what you do and screw the logic behind it, just do it.
Mixter's Primer of Navigation is a much thicker old-fashioned book that covers the history, logic, progression of navigation and presents things in a much more comprehensive fashion. I'd say there's certainly room for both approaches, because understanding how the 'machine' works, makes it a much different experience.