look at the real info that I have linked to. The majority of air traffic contols stations DO NOT use GPS. Not knowing where a plane is and at what height isn't the best way to 'control air traffic' In the future when the majority of ATC can use GPS then things will change and yuo do know that with GPS the ATC building doesn't even have to be located at the airport it can be almost anywhere.
Having been caught out, you are ignoring the correction.
He's now changing the goalposts. Definitely inebriated. Perhaps this is why he's in my KF.
What correction is that then. The one where it flies close to airports rather than across the sea where there's no radar.
You can plot great circleroutes on this:-
So. Why did the plane follow the eastern USA coastline then ?
GPS systems CAN calculate altitude but, as the GPS receiver is on the plane, it won't be much use to ATC until a reliable method of ensuring that this data is also available to controllers in at least as accurate detail as current radar systems.
Because that was tehn great circle route from London to Mexico
I already explained that to him, but seems he ignored it.
What drivel you spout.
Also known as "squawk"
If you're in an aircraft with a transponder/squawk, the operating light comes on every time it's "swept" by ground ATC radar indicating the ID signal has been sent out.
But that doesn't mention GPS at all and is purely concerned with communicating with the aircraft via RADAR.
Where GPS data from the aircraft would be useful is to track aircraft which are out of RADAR range.
How often does a plane vanish and nobody has a clue whereabouts in thousands of square miles of ocean - in at least one case, over a million square miles - to start looking?
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