Displays a map on which the great circle path for one or more routes is plotted and calculates the distance along each route. Ranges from one or more locations may also be plotted, along with go/no-go areas for ETOPS operations at various rule times.

andrew-gray.com - homepage of Andrew R. Gray

Ed Williams' Aviation Page

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The Great Circle Mapper displays maps and computes distances along a geodesic path. It includes an extensive, searchable database of airports and other locations.