Originally Posted by
slip and turn
I didn't include the ground roll in my graphic simply because my interest was in what happened from rotation onwards.
One question about how the transmitted pressure altitude is auto-calibrated prior to flight. Clearly a complex aircraft like this on the ground at a well charted licensed airfield knows exactly where it is and at what altitude, so does it continuously calibrate itself whilst it is on the runway up to the point WOW and groundspeed, and GPS data tell it it may be airborne?
Nothing so complicated.
The aircraft simply transmits either a Ground Position ADS-B message, which for obvious reasons doesn't need to contain an altitude, or an Airborne Position, which does.