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With just four required items: 1-This all inclusive book (with simple terms, teaches you how to use a sextant/navigate and includes all celestial data needed till the year 2056), 2-sextant, 3-compass and 4-universal time (shortwave radio or time piece) you can navigate the globe by using latitude and longitude derived from the sun with these four items and have peace of mind knowing that you have a reliable backup to GPS. Once you have your position in latitude and longitude, this book teaches you basic navigation (destination, heading and distance), so you will never be lost.For safety reasons and because equipment fails, batteries die, and equipment falls overboard, people going to sea should have at least two different methods of navigation. The preferred primary method is using a GPS system. This book will teach a secondary backup method of my version of the