Ing Global Positioning System (GPS) metung yang sistema ning pamaglayag a pangyatung gagamit satellite (global navigation satellite system) (GNSS) a ayalkus ning United States Department of Defense, at panibalan ning United States Air Force 50th Space Wing. Ya kabud ganap a gaganang GNSS king yatu, maliari yang gamitang timawa ampong alang bayad, at maras, magsilbi ya kareng sibilian king pamaglayag. Gagamit yang constellation da reng pilatan ning 24 ampng satellite a Medium Earth Orbit a magparalang eksaktung senias a microwave, a sasaup kareng GPS receiver a mangarcula king salukuyan dang pusisiun o kabilian, ing oras, ampo ing karelang bilis o salusu (velocity). Ing opisial nang lagiu, NAVSTAR GPS. Lipat ning e ya acronym ing NAVSTAR, melalang la reng mapilan a en:backronym para kaniti.