Fundamental concept in GPS applications is that you can determine fairly accurately (ordinarily within 10-30 meters) the location of any device that has a GPS transceiver mounted inside the device. This determination of this location is facilitated by a series of satellites maintained by US defense establishment. Having determined the location of an object one can track its movement as it moves. Therefore, you can implement a number of business and personal applications based on this location like fleet management, health services in the public sector and number delivery services.