^{user will think if theres more function like: I want to see my car on the map. I f theres several cars, what shall I do] Can I store all the coordinates for a trace}

^{with this solution has more exciting functions let user to make it. User need connect a GSM modem with computer, and then install the software to pc. The software runs into mode: GSM or GPRS. If theres no internet connection, you could use GSM mode; if yes, user could track real-time and see his car on the map.
 
This solution can show users car real time on the map. And it use GPRS to transfer information, it has more powerful function as the mileage, history trace and so on.}