A320...GPS Altitude Vs Altimeter Altitude
Hello...
i have noticed during flights that the GPS altitude is always higher than the maintained Flight Level...
i have seen it last time while we were at FL360 ...the GPS alt was 37650 feet.
i was trying to look for it the books but could not find the required info about it .
what is the base for this altitude...see level/ground level ?
i am confused about this issue...
in FCOM 4 it says GPS altitude displayed for information purposes !
appreciate any light shedding on this.
thanks in advance.