Lockheed Martin said it delivered the first modernized GPS satellite to Cape Canaveral Air Force Station in Florida and the spacecraft is undergoing final preparations for its May launch. The satellite, designated GPS IIR-M1, will provide significantly improved navigation performance for U.S. military and civilian users, Lockheed Martin said. It is the first of a series of eight GPS IIR satellites that Lockheed Martin is modernizing for the government fleet.