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You can use any number of a solutions and services that will allow you to track your car, your PC, your, phone, your pets and your kids. Even your spouse or your boss if you are so inclined.
Here is one solution you can use, it is self-contained and does not require wiring into the vehicle.
http://www.trakdot.com/TrakDot/index.jsp
Here is an article about tracking your car from Gizmodo.com
How To Track Your Vehicle on the Cheap
http://gizmodo.com/5691724/how-to-track-your-vehicle-on-the-cheap
In fact, there are entire companies, and websiters and devices devoted to exclusively tracking vehicles like this one from My Car Tracks:
http://www.mycartracks.com/
GPS Locators for People, Pets and Vehicles
www.pocketfinder.com/
PocketFinder family of GPS locators helps you stay connected with People, Pets and Vehicles.
The kind of tracking system you're looking for is actually a combination GPS receiver with a data link to a cell phone link and the software for you to interpret and display the location data on an overlay of a map. They are available but are expensive.
Whenever GPS for PC is concerned, the captioned are more viable. Otherwise you'll have to search for vehicle GPS hardware with a computer interface.
Many businesses & government agencies install GPS tracking devices on their vehicles & equipment for tracking purposes. It can be useful for things such as clearing snow....you can determine which roads have already been cleared & how long before the plow reaches blocked roads.....things like that.
Is it possible to look at a GPS on a computer.