Bad home altitude

ArduPlane
1

Hi,

Somebody can explain why my gps ( 3Dfix) give me 1500 meters of différence with my home altitude ?

2

Without more context and a .bin log file, no we can’t.

3

hi,

thanks for the answer .
https://www.dropbox.com/scl/fi/w80wu9cdn6v8l33etai2w/2024-07-24-17-20-30.bin?rlkey=mq8ooznb53o3ho2afk2y5iqnr&st=5rx0l885&dl=0

4

ha, i fly in the mountain . My spot is at 1500 meters …

1 Like
5

Your starting point is about 1500 metres above sea level. The GPS altitude is displayed above a geoid that is approximated to MSL (mean sea level), the altitude displayed by Ardupilot is usually displayed above the starting point (altitude when arming)

6

Thanks for the answer .
I understand but why is
My home altitude 0 at the beginning and one instant after i’m at 1500 Meters above ?
I’s clear on the UAV log viewer .