Flying with rtk, just altitude keep drop and climb, seems like the EKF just not refresh the altitude
log file https://drive.google.com/open?id=1FjwJXhfhjVjigDzlxsT5ounfbyyNrTYv
For serious situation the altitude Estimate totally stop working making the drone can not land in ALT Hold ,Loiter ,RTL Mode
just found this useful video
just check all the values in dataflash log, only the NKF5.ePos seems to related with EKF altitude none updated
Trying to find out whether the EKF use the gps data or not, is this condition can be replay with dataflash log?