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Why Celestial Navigation

FOR ELECTRONIC BACK-UP GPS is wonderful. World-wide coverage and reasonably priced receivers (both installed and handheld) contribute to maritime safety through accurate positioning of vessels. Yet, some back-up is needed. Instances of electronic failure, total electric failure, lightning strike, and…

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Using a Sextant

A sextant is an instrument generally used to measure the altitude of a celestial object above the horizon. Making this measurement is known as sighting the object, shooting the object, or taking a sight. The angle, and the time when it was…

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Selecting a Marine Sextant

The first choice to make is between plastic or metal construction. Today's low cost metal sextants offer high accuracy and ease of use. These reward the beginner's efforts, and satisfy the professional's demands. Plastic models are perfect for lifeboat provisioning,and…

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Choices in Plotting Tools

Beginners typically ask which plotting tools they need. It’s a good question, because the available range of tool types is greater than one would likely need. For example, parallel rules, rolling plotters, course plotters, triangles and plotting board pantographs all…

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