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Celestial Navigation

Celestial Navigation - the book

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Mark Breach

Christine Breach

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Astrogeodetic Levelling - PhD Thesis

Jaguar 27


Celestial Navigation

     The resource site for “Celestial Navigation when your GPS fails! by Mark Breach     



"Celestial Navigation when your GPS fails!" is about finding position at sea from the Sun, Moon, planets or stars. If you have a sextant and the time, in both senses, the book with this companion website contain all the information and data you will need to find your position.

This resource is for real and aspiring bluewater sailors; those who leave the sight of land and rely on various electronic devices for navigation. When satellite navigation fails because of seawater in the electronics or just plain battery failure then being lost at sea is a life-threatening situation, especially when night falls.

Celestial Navigation - the book