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Summary: GPS comes preloaded in many automobiles, but some require disks in order to work for a given vehicle. Find out how an automobile GPS can be bought to fit on the windshield or dash with help from a car salesman in this free video on GPS.
"Automobile GPS Systems. Automobile GPS Systems are in a lot of cars these days. High-line cars seem to offer more than some of the other lower end models. GPS's come in many different ways. Some GPS Systems have a disk that have to be loaded for each region. Some GPS Systems come preloaded for all the different regions. Some GPS Systems are easier to use than others. What I recommend is going in to the dealers and trying each one to see which one is more comfortable. Now if there is a make or a model that you like more than another hopefully it has a GPS System that you're comfortable in using. Hopefully it has one that you don't have to buy a bunch of different disks for specific regions. And if you're buying one used make sure those disks are there and somebody hasn't forgotten to put them in the vehicle because you'll have to have those disks to make the GPS System work for that vehicle. If there is a vehicle that you like a make and model that you like and it doesn't have a GPS System either it's not available on that model or for one it just hasn't come with it and you're buying the vehicle pre-owned you can go down to your local store and buy one of those. You can go down to your local store and buy a GPS System that will fit on the windshield or fit on the dash. And some of those can be even easier to use than the ones that are factory installed and cheaper."
eHow Article: Automobile GPS Reviews