GPS Backup with a Plastic Sextant Brian Gilbert Improvise your own knotmeter or

Improvise your own knotmeter or plumb-bob sextant

precise operation

oversized embroidered stars and hand-sewn stripes of lightweight

Celestial Navigation for Yachtsmen has been the best-known

GPS Backup with a Plastic Sextant Brian Gilbert Improvise your own knotmeter orby 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