GPS Backup with a Plastic Sextant Roger Marshall It's a comprehensive and accessible

It's a comprehensive and accessible study that's also a compelling analysis of the secrets of Viking navigators

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Our straight pattern navigational dividers are made with brass arms and polished stainless steel tips

Scale: 1:90

GPS Backup with a Plastic Sextant Roger Marshall It's a comprehensive and accessibleby David Burch No power, and batteries used up? This book and a Mark 3 sextant lets you carry on. For those who choose not to invest the time and money to learn the full range of celestial navigation, this booklet and a Mark 3 sextant provide a minimum backup kit that can be used to navigate across any ocean. This book provides a means of learning and executing a position fix at sea when a vessel has run out of power and all the batteries have been