<P> The Global Positioning System ( GPS ) , originally Navstar GPS , is a satellite - based radionavigation system owned by the United States government and operated by the United States Air Force . It is a global navigation satellite system that provides geolocation and time information to a GPS receiver anywhere on or near the Earth where there is an unobstructed line of sight to four or more GPS satellites . Obstacles such as mountains and buildings block the relatively weak GPS signals . </P>
what is the full form of g p s
Global Positioning System