A different GPS Question
I have a GPS, so I don't want to know where to get a one, which one is the best or cheapest, nor debate the ethics of using it,
What I want to know is, how does the GPS second guess what you are going to do?
Assume that you are GPSing from A to B and on to C.
You get close to B, the Geeps is counting down the miles when you decide to cut the corner and route direct to C. So the miles-to-go to B slows down, stops and then starts to increase again.
How does the Geeps know that you are now en-route to C? At what point does it say 'Ahh sod it - this guys going to C'. Why doesnt it say 'Excuse me, you have to pass B (& collect £200) before I'll let you go to C'?
What would happen if you got a few miles out from B, Geeps is counting you down to C and you turned round?