http://www.fai.org/downloads/civl/CIVL_2017_Minutes

The last discussion was about changing the distance formula from
FAI sphere to WGS84, which is required by the FAI general section. This cannot
be done on a general basis today for hang gliding, as the majority of the pilots
in the next Cat 1 event will still be stuck with older FAI sphere only
instruments (Flytec 6030's), while it is viable for paragliding where the access
to newer instruments makes this less of a problem. The time frame for changing to
SeeYou/GAP scoring from May 2018 would include the change to WGS84, and as such
it should be a natural point to introduce this change for both hang gliding and
paragliding in the rules regarding distance calculations. If possible, we could
implement WGS84 as an option in FS in addition the FAI Sphere from now on, and
this option could be used where appropriate in PG competitions with large
turnpoints.