XPLMSetDestinationFMSFlightPlanEntry

XPLMSetDestinationFMSFlightPlanEntry

XPLM_API void       XPLMSetDestinationFMSFlightPlanEntry(
                         XPLMNavFlightPlan    inFlightPlan,
                         int                  inIndex);

This routine changes which entry the FMS is flying the aircraft toward. The track is from the n-1'th point to the n'th point.