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Many varied uses for Global Positioning System exist. GPS is able to measure position very accurately, and positioning signals are available to users around the world at all times. These features account for the popularity of GPS with many diverse groups.
The Global Positioning System was designed for precise, real-time military positioning. The military utilizes GPS in land, marine, and airborne navigation. In addition, GPS satellites are equipped with sensors to monitor and detect the detonations of nuclear weapons. However, navigation is the main function of GPS, with uses in all branches of the military. Some examples are photo reconnaissance, low-level navigation, target acquisition, command and control, en route navigation, and missile guidance.
Although GPS was designed for military use, civilian use of the navigation technology has dramatically increased with the advent of affordable, portable GPS receivers and the ability to increase the accuracy of civilian GPS readings. A major use of GPS is for surveying and mapping, including land, marine, and airborne surveying, local and global deformation monitoring, and geodetic control. Applications in transportation and communication include automotive navigation aids, with an automated display of the vehicle position on an electronic map. This is particularly useful for emergency vehicles and search and rescue missions. Monitoring the location and movement of vehicles such as taxis, trucks, and boxcars can also be achieved using GPS. Recreational activities have also become a large market for low-cost, portable receivers. Boating, backpacking, biking, and horseback riding are a few of the activities whose participants use fairly inexpensive, relatively low accuracy (good to tens or hundreds of meters) GPS receivers.
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