Quote:
Originally Posted by Rob_E
My understanding, and I'm no expert by any means, is that GPS in your car and GPS in the iPad/iPhone or in any GPS receiver work using similar chips and by the same method which is:
GPS locates satellites and "pings" them by sending a little packet of information to the satellites and then seeing how long it takes for the signal to come back. Then it does a lot of fancy math to figure out where you must be in relation to those satellites to account for the time differences in the return signal. If it can locate enough satellites, it can give you a pretty precise set of co-ordinates.
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So reviewing to make sure I understand:
If you have a GPS chip in a device, it can locate itself on maps stored on your device. And even without wi-fi or 3G, your GPS chip can communicate with satellites, and between the two, they triangulate your position and can use existing stored maps to figure out where you wanna go next?