This neat little book shows you how, as long as you have a reasonably complex pocket calculator that you can handle trigonometric functions and their reciprocals Ausmarine (May 2010)
Francois Meyrier has been practising astro navigation for many years since developing a passion for the subject during his military service in the National Marines. He has taught astro navigation for many years, more recently at the Naval Centre at Glenard. He has skippered boats in all the seas of the world.