A satellite-based navigational system permitting the determination of any point on the Earth with high accuracy. Abbrev: GPS. GPS is used in mapping, mineral exploration, and GIS data collection. The systems depend on the Navigation Satellite Timing and Ranging (NAVSTAR) GPS developed and operated by the U.S. Department of Defense, which consists of a network of 25 satellites in orbit about the Earth as well as ground operations support. After all the satellites are deployed, GPS will provide all-weather, worldwide, two- and three-dimensional (latitude, longitude, and elevation) positioning capabilities over a 24-h period.