GPS Block IIIA, or GPS III is the next generation of GPS satellites which will be used to keep the Navstar Global Positioning System operational. It is the U.S. Air Force's next generation Global Positioning System.
Lockheed Martin is the contractor for the design, development and production of the GPS III Non-Flight Satellite Testbed (GNST) and the first eight GPS III satellites.
The United States Air Force plans to purchase up to 32 GPS III satellites. GPS IIIA-1, the first satellite in the series, is projected to launch in 2014.