There is even a book on how to use them called "How to Use Plastic Sextants" by ... | Hacker News

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gcheong on May 6, 2018 | parent | context | favorite | on: AstroNavigation – A free course

There is even a book on how to use them called "How to Use Plastic Sextants" by David Burch who seems to be a fairly prolific author on celestial navigation http://a.co/0iVNVrW

keithpeter on May 6, 2018 [–]

Linked to that book page on Amazon is the Davies 'quick reference card' (laminated) that I imagine one would have in the life boat...

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