Measure distance on great circle

Go to Tools > Options > General, you will see that it is possible (user selectable) to use either the FAI Sphere or the WGS84 ellipsoid. 

Calculating with WGS 84 Ellipsoid will calculate the great circle distance between points. Calculating on FAI Sphere will calculate the distance on a sphere as defined by the FAI.

Updated on March 11, 2021

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