GPS isn't doing the tracking. The tracking system is using GPS.
Do you understand that if the earth were flat, there would be 3 times as much area in the southern hemisphere than the northern hemisphere? Where is all the missing area? Why don't flights take 3 times as long?
Thank you for proving my point this is exactly why they can't show the flights over the southern hemisphere oceans on flight tracker as it wouldn't corelate with the globe.
Incorrect, again. These flights correlate perfectly with the expected
Great Circle Route modified according to the expected winds.
https://www.flightradar24.com/-31.45,-286.71/2
Why don't you learn a bit about the topic before making a fool of yourself, again?
But flights "disappear" simply because FlightAware's tracking is via the
ADS-B ground based system which interrogates the on board transponder for the GPS location of the plane.
These ADS-B systems only have a range of a few hundred miles and there are few across the southern Indian and Pacific Oceans.
Once any aircraft is out of range an ABS-B transmitter it cannot be tracked.
You can look up more in
FlightAware and ADS-B.
A satellite implementation of the ADS-B system is currently being installed.
But here is one Sydney to Johannesburg flight.
QANTAS flight QF63 flew Sydney, Australia to Johannesburg, South Africa in 13 hrs 15 min (on May 10, 2016), covering 11,286 km
Flight QF63 Sydney to JohannesburgOnly the parts in yellow are tracked with ABS-B and the rest are usually "filled in" a great circle path.
For past flights, the actual GPS track of the plane can be often downloaded from Flighaware.
Look at the distance and path of a Sydney to Johannesburg on the usual Flat Earth map:
1892 - Gleasons Map - Air Routes, with distancesNot only is the initial heading far different from the
tracked initial heading of the real route, the distance of almost 23,700 km is far in excess of the range of a 747-400.
Also, that 23,700 km could never be flown by any commercial airliner in 13 hrs 15 min.