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I can confirm that it works well. MP will be using WGS84 for its distance calculations, and I suspect this results in very small errors.
(you are correct that if you use the wrong geoid for plotting then errors of 100m or so are probable).
About 12 months ago, I had to write some code that performed extensive geometry calculations. I foget the details now, but I did have to make the decision "spherical Earth" or "elliptical Earth". When I got as far as estimating the differences it was a matter of metres within distances of 100km+.
Richard |