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This title explains mathematics essential to flight navigation in classic general and philosophical approach similar to Stick and Rudder (Langewiesche) and Weather Flying (Buck), teaching basic principles and reasoning. It assumes little mathematical background but takes simple straightforward approach to nav math that combine both ancient celestial forms upon which new technologies. It provides understanding of navigation that allows pilots to exploit full powers of new technologies. It presents techniques of GPS and other nav forms, including calculations of distance and bearings. It features chart construction, errors, and uses; magnetic compass, errors, uses; mental calculations and rules of thumb; and, flight planning, especially long-range.