The book you need when the GPS fails. Ingeniously condensed data tables and clear instructions enable you to pinpoint your position with only a sextant. This new edition features an updated five-year nautical almanac, plus a primer on celestial navigation basics. Dr. George G. Bennett owns and directs CN Systems, which produces navigational calculator and computer software. He has navigated boats in a number of major ocean races, received numerous honors and taught navigation for 20 years. Spiralbound.