01656oam 2200421 a 450 991069907810332120090811133900.0(CKB)5470000002399102(OCoLC)320839341(EXLCZ)99547000000239910220090512d2009 ua 0engurmn||||a||||txtrdacontentcrdamediacrrdacarrierGlobal Positioning System[electronic resource] significant challenges in sustaining and upgrading widely used capabilities : report to the Subcommittee on National Security and Foreign Affairs, Committee on Oversight and Government Reform, House of Representatives[Washington, D.C.] :U.S. Govt. Accountability Office,[2009]1 online resource (iii, 55 pages) illustrationsTitle from title screen (GAO, viewed May 12, 2009)."April 2009."Includes bibliographical references.Global Positioning System Global Positioning SystemArtificial satellites in navigationAstronautics, MilitaryUnited StatesGlobal Positioning System.Artificial satellites in navigation.Astronautics, MilitaryUnited States.Congress.House.Committee on Oversight and Government Reform.Subcommittee on National Security and Foreign Affairs.DIDDIDCBTGPOBOOK9910699078103321Global positioning system55700UNINA