GPS navigation systems use a network of geosynchronous satellites that orbit the earth to determine the location of people or objects within a few feet of their location. GPS systems were first used to help the military in target location and in navigation. More recently the cost of GPS hardware has fallen, allowing accurate civilian use; this is also due to the enhancement of signal quality by the military.

The technology of GPS has been of great benefit to companies for keeping track of the vehicles within their fleets and also providing a way for drivers to be more efficient in making deliveries and estimating time of delivery. GPS tracking systems for vehicles have even been useful for finding the best way for drivers to get to their locations.

There are those, however, who warn of a possible negative effect of using a GPS system, viewing it as constituting an erosion of privacy. Some taxi, truck, and limo drivers are already having their trips scrutinized in this way. On the positive side, GPS technology has proven effectiveness as a means of tracking would-be terrorists, and has been used for some time by federal agents.

GPS has come a long way since its inception. Its applications for the individual consumer have multiplied greatly. Now people can utilize their GPS systems for planning out their hiking routes, setting locations to camp or fish, or just finding their way around in any place they don't know well. A new kind of activity called "geocaching" is like a hide-and-seek game, using a container and a set of location coordinates.

GPS tracking systems have also allowed the development of a new automotive add-on, the in dash GPS receiver allowing consumers to request a location and have the device display or speak directions to the driver, making the paper map obsolete. These devices are already increasing in complexity and adding new features including hotel and restaurant information.

GPS devices are likely to become increasingly common as the cost of GPS devices decreases. GPS technology is quite flexible, and it is not difficult to envision it completely replacing current technologies such as paper maps. Nor is it difficult to imagine it playing an important role in new technologies. Who knows, perhaps one day GPS tracking will make loss and theft a thing of the past by providing real time information about the location of all our possessions.