You do know that GPS isn't a pin point accurate system don't you?

Apart from the fact that one decision is based on the absolute position of the players and the ball and the other is based on the relative position of the players and the ball, you are right, they are exactly the same

Good quality ones are. They use them in geology to measure land movement of millimetres over long periods of time.

No I said the system you proposed wouldnt be possible. To avoid confusion i mentioned Hawkeye the company, not hawkeye the system.

Even for you Smokey, that's a poor attempt to wriggle out of something you've said!

Its not really complex to say there may be an engineering solution for accurate judgement of forward passes, but your's wasnt it.