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XPLMSetFMSEntryInfo

XPLM_API void       XPLMSetFMSEntryInfo(
                         int                  inIndex,
                         XPLMNavRef           inRef,
                         int                  inAltitude);

This routine changes an entry in the FMS to have the destination navaid passed in and the altitude specified. Use this only for airports, fixes, and radio-beacon navaids. Currently of radio beacons, the FMS can only support VORs and NDBs. Use the routines below to clear or fly to a lat/lon.