Latitude by Polaris
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Because some things in life are simple

So here's the basics, when you measure the altitude of polaris with a sextant, that is a very good rough estimate of your latitude. All you need to do now is correct for instrument error, index correction, height of eye, and an altitude correction.

Here's a YouTube video that explains how the Ho and Lat are related and how you can make your own paper plate calculator: http://www.youtube.com/watch?v=ByD5by_PL64

Yet another link:
http://www.math.nus.edu.sg/aslaksen/gem-projects/hm/0203-1-12-celestial_navigation/polaris.htm

lat_by_polaris.jpg