Great Circle Sailing distance calculator - loxodrome (rhumb line)
Why Are Great Circles the Shortest Flight Path? - GIS Geography
A SYSTEMATIC APPROACH FOR SOLVING THE GREAT CIRCLE TRACK PROBLEMS BASED ON VECTOR ALGEBRA
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Great Circle Sailing | PDF | Navigation | Cartography
Navigation Basics
What is the reason that some flights use “great circle” routes while others fly straight lines that often intersect land masses and coastlines, adding time to travel distances? - Quora
Great Circles on Mercator's Chart - Wolfram Demonstrations Project
The Airline Pilots Forum and Resource
Why Are Great Circles the Shortest Flight Path? - GIS Geography