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.

There's nothing like GPS tracking systems for keeping tabs on a company's motorized assets. Not only do such systems help optimize drivers' delivery performance, it also makes estimating delivery times far more accurate. These global positioning systems also make it possible to map out the best routes to maximize driver efficiency.

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.

The advent of GPS technology has had an impact on many recreational activities such as hiking, camping and fishing because it allows GPS users to better navigate new areas. Additionally, a new recreational activity has come from GPS itself, an activity called "geocaching." This new activity is something like a game of hide-and-seek using the longitude and latitude coordinates to locate a particular container.

GPS tracking systems can now be purchased from an automotive dealer as an additional feature to a new car. They can be mounted directly into the dash of the car for easy access to the driver. These devices provide searches which include restaurant and hotel mapping. It is nearly impossible to get lost with one of these devices in the car.

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.