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.

One of the negatives that has come about more recently is invasion of privacy. As these devices are used more and more frequently in our lives, they will continue to present these challenges. Truck drivers were among the first to be tracked and their movements are now analyzed as well. Spies have long known that GPS tracking can be very effective in tracking the movement of individuals.

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 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.

Satellites allow GPS units to locate and track objects and people. GPS was first used by the United States military for targeting and navigation. Accuracy of the GPS signal for the general public has improved since the military stopped degrading the signal available to civilians. Delivery companies make widespread use of GPS vehicle tracking systems for scheduling and route efficiency. In private automobiles, GPS tracking systems simplify navigation. Outdoor enthusiasts have made GPS devices common in recreational pursuits. "Geocaching" is a hobby that uses a GPS tracking device to find hidden treasures. As prices drop, the use of the GPS system will continue to render older methods of navigation obsolete.