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* [http://mathworld.wolfram.com/GreatCircle.html Great Circle – from MathWorld] Great Circle description, figures, and equations. Mathworld, Wolfram Research, Inc. c1999
* [http://demonstrations.wolfram.com/GreatCirclesOnMercatorsChart/ Great Circles on Mercator's Chart] by John Snyder with additional contributions by Jeff Bryant, Pratik Desai, and Carl Woll, [[Wolfram Demonstrations Project]].
* [https://sites.google.com/site/navigationalalgorithms/papersnavigation Navigational Algorithms] {{Webarchive|url=https://web.archive.org/web/20181016042619/https://sites.google.com/site/navigationalalgorithms/papersnavigation |date=2018-10-16 }} Paper: The Sailings.
* [https://sites.google.com/site/navigationalalgorithms/ Chart Work - Navigational Algorithms] Chart Work free software: Rhumb line, Great Circle, Composite sailing, Meridional parts. Lines of position Piloting - currents and coastal fix.