All distance calculations for soaring records are made using the WGS-84 datum and the Official FAI online distance calculator. This calculator uses a recursive calculation method known as the Vicenty algorithm. The old great circle formula yields different results.
Wouldn't it be nice if programs like SeeYou used this same algorithm?
I claimed a free triangle distance record this summer and I probably spent as much time going over the IGC file trying to optimize my distance as I did flying it! The flight was a closed course, but the main problem was finding the three fixes that gave me the greatest possible distance that still complied with the 28% rule (no leg of the course may be shorter than 28% of the total distance).
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