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voor de liefhebbers van navigatie zonder stom-stom :)

A Short Guide to Celestial Navigation (Paperback)
~ Henning UMLAND (Author) 
1 pdf

Celestial navigation is the art and science of finding one's geographic position by means of astronomical observations, particularly by measuring altitudes of celestial objects - sun, moon, planets, or stars

The e-book is published unter the terms and conditions of the GNU Free Documentation License. It is intended for readers familiar with the fundamentals of geography, algebra, and geometry. In particular, the trigonometric functions should be known. Everything else is explained in the text. 

Product Details
Paperback 
Publisher: Henning Umland (2001) 

Thanks to Xrypto :)