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Wayfinding, or Non-Instrument Navigation - http://pvs.kcc.hawaii.edu/L2wayfind.html
How Polynesians navigated before the invention of the compass, sextant, or clock. |
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The Seamans Secrets - http://www.mcallen.lib.tx.us/books/seasecr/dseasec1.htm
Text from a book originally printed in 1657 that discusses tides, declinations, and other marine navigation topics. |
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The History of the Sextant - http://www.mat.uc.pt/~helios/Mestre/Novemb00/H61iflan.htm
Transcript of a talk given at the Science Museum of The University of Coimbra. Includes photos of ancient devices. |
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Understanding How Thompson Navigated - http://www.northwestjournal.ca/dtnav.html
About David Thompson's exploration of western Canada and the northwestern United States from 1790 to 1812, using a sextant and compass. From the Northwest Journal. |
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Evolution of the Sextant - http://www.westsea.com/tsg3/octlocker/octchart.htm
Illustrated article including details about dating. Links to antique instruments offered for sale. |