Explanation:

The Global Positioning System (GPS) is  a  space-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. The GPS system operates independently of any telephonic  or  internet reception, though these technologies can enhance the usefulness of  the GPS positioning information. The GPS system provides critical positioning capabilities to military, civil, and commercial users around the world.  The  United States government created the system, maintains it,  and  makes  it  freely accessible to anyone with a GPS receiver. However, the US government can selectively deny access to the system, as happened to the Indian military   in 1999 during the Kargil War.