Space: Status of the Navstar Global Positioning System: Psad-78-37

The NAVSTAR Global Positioning System is a satellite-based radio navigation system which will consist of 24 satellites, ground control equipment, and user equipment for a variety of Department of Defense applications. All military services are participating in the program with the Air Force acting as management executive. Program costs are estimated at $3.7 billion, including $1.5 billion for the Global Positioning System, $1.7 billion related to user equipment, and $0.5 billion for replenishment satellites.