The Global Positioning System is a satellite navigation system, developed by the Allies during the Great World War II. Requiring an effective way to scout enemy positions quickly, Allied scientists developed the ultimate scout: a spaced-based satellite system capable of granting the commander visibility over the entire battlefield.
Due to the extreme technological expertise needed, a GPS satellite could only be granted to an Allied base that had a tech center. Once built, Allied technicians would prepare a satellite for launch, and after preparations were made, the satellite would be launched into medium Earth orbit, revealing the topography of the area of operation, as well as the location of any enemy units.
Following the war, GPS was commonly used for both military and civilian purposes, however, by the First Tiberium War, Nod had developed several specialized techniques and technologies for fooling GPS; forcing GDI to resort to old-fashioned methods of scouting. Regardless, the GPS satellite formed the backbone of the future satellite network of the Global Defence Initiative.