Originally Posted by
TangoAlphad
Don’t most ATC units display data sent from the aircraft, not radar calculated ground speed? Genuine question.
No, *some* ATC facilities have the ability to receive and display airspeed data sent from the airplane. It's not anywhere close to *most* This is implemented in Europe, and maybe a few other places. It is not implemented in the US, at least according to my conversations with US Controllers. I'd be surprised if this was installed in Indonesia. Generally, Air Traffic Control is transitioning to being based on self reported position and altitude but it's just in the beginning stages of that. For the most part Air Traffic control is still based primarily on ground radar information .