Bowditch edit / delete

The US Government's guide to marine navigation. I came here looking for information on how a sextant is used, and ended up reading through the whole thing - it's fascinating. The sections on LORAN and on the unique problems of navigating in the Arctic are particularly interesting...

to arctic gps loran maritime navigation retrotech sextant shipping ... on 21 November 2018

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- sextant
 
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