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Great Circle Mapper
A site for generating maps of great circle routes (shortest paths between two points on a sphere's surface; technically geodesic paths when referring to the earth) and related information. This hobbyist site warns that its information "may not be accurate or current and is not valid for navigation or flight planning," but armchair aviators will still find it fascinating and educational to plot maps by paths, ranges, air speed, and other aeronautic measurements.
http://gc.kls2.com/
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