Originally Posted by
dbenj
Feel free to correct me if I am wrong, but I believe the data being discussed is ADS-B data from ADS-B Exchange. ADS-B does not rely on airspeed or altitude data generated by the aircraft, but rather reports on WAAS GPS generated data.
I am not sure any of the 2 aircraft involved were equipped with ADS-B out , more likely the data you are talking about comes from F24 , and the data then coms from the transponders relayed via a few private antennas on the ground. It is not the certified ADS-B we talk about in ATC or Commerciall aviation.
As to using the vertical rates mentioined earlier , I persoally doubt the calculations and the figures posted . , FR24 is a great tool but is not exact science