paolina_3 ® 20-Jun-2020 16:38

Celestial Navigation, A Practical Guide to Knowing Where You Are


Year: 2018
Language: english
Author: Dave Berson
Genre: Manual
Publisher: Seahorse Publishing
ISBN: 9781944824037
Format: EPUB
Quality: eBook
Pages count: n/a
Description: The aim of this book is to present, in a simple and direct way, the basics of celestial navigation, and also to correct many misconceptions surrounding its learning and practice. It is no longer true, for example, that mariners should be familiar with spherical trigonometry. Nowadays sight reduction tables in use (HO 249) have been simplified, and a mathematical knoweledge is no longer necessary; they are specifically designed for a simple and fast use. Another misconception is that celestial navigation is outmoded and has no value. Of course GPS and its accuracy must be in everyday's use, but GPS relies on satellites and is neither easy nor inexpensive to troubleshoot. Celestial navigation, on the other hand, is virtually foolproof, once the basics are mastered, and so important that the US Navy has reinstated teaching it to its cadets at the Naval Academy.
The author, a columnist for Ocean Navigator magazine and a sailing instructor, describes, in a concise and clear way, the basics of the celestial navigation; the celestial sphere, the nautical almanac, time and local hour angle, dead reckoning and assumed position, the sextant, sight reduction and use of HO 249 tables, the noon sight.

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