The Global Positioning System (GPS) is a space-based global navigation satellite system (GNSS) that provides location and time information in all weather, anywhere on or near the Earth, where there is an unobstructed line of sight to four or more GPS satellites. It is maintained by the United States government and is freely accessible by anyone with a GPS receiver.
The GPS program provides critical capabilities to civil and commercial users around the world. It is an engine of economic growth and jobs. In addition, GPS is the backbone for modernizing the global air traffic system.