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"Steven P. McNicoll" wrote in message A straight north-south line is a great circle on all the common chart projections. Correct. Those are the two [possibly rare] exceptions to my post -- if you happen to be flying a course of true north or south anywhere, or a course of true east or west on the equator, then your course will layout as a straight line and will be a great circle on any chart projection. I probably should have mentioned it, lest someone get lost and run out of fuel. |
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