GPS
Developed by the United States Department of Defense, GPS is officially named Navstar GPS. Its name came from John Walsh, who was a key decision maker involving the budget for the technology program.
It is the only fully functional Global Navigation Satellite System Utilizing a constellation of at least 24 medium Earth Orbit satellites that transmit precise microwave signals, the system enables a GPS receiver to determine its location, speed, direction, and time.
The satellite constellation is managed by the United States Air Force 50th Space Wing. In 1983, President Ronald Reagan issued a directive making the system available for free for civilian use as a common good. Since then, the technology has become a widely used aid in navigation worldwide, and a useful tool for map making, land surveying, commerce, and scientific uses.










