Originally Posted by
Green.Dot
Anybody who wants to embarrass themselves further with sketchy ADSB data (may be accurate, may be not), please take in to account it gives GROUNDSPEED data and AMSL altitude.
In fact it gives pressure altitude - to derive AMSL, you need to adjust for QNH.
But your point about the limited value of GS is a valid one, particularly given the reported wind strength at the scene.