This article describes about the total process of GPS, how it works, the author explains about the navigational system of GPS and then explains about technology involved can help a person to reach the target in any part of the world and then author explain about the true name of GPS device and where the system can be used from which department and also explains about the three major components used by GPS device, and then she explains about the approximate km it needs to reach the above earth surface and then explains about the working of GPS system, frequency type, frequencies range and then author explain about the tracking device.
Interesting article to read: GPS System