GAO Report on GPS. “Significant Challenges in Sustaining and Upgrading Widely Used Capabilities”. Presented on 30 April 2009 to Subcommittee on National Security and Foreign Affairs, Committee on Oversight and Government Reform, House of Representatives Released to the public on 8 May 2009
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“Significant Challenges in Sustaining and Upgrading Widely Used Capabilities”
Presented on 30 April 2009 toSubcommittee on National Security and Foreign Affairs, Committee on Oversight and Government Reform, House of Representatives
Released to the public on 8 May 2009
33 in orbit
7 last clock
Riedesel, CGSIC48  Sept 08
PDOP map for 17 May 2009
Launchesfrom Dec 2005
Military use of modernized signal
Army, Navy, Marine Corps fully equipped with modernized GPS equipment by 2025,
12 years after IOC - 18th modernized launch (2013)
10 years after FOC - 24th modernized launch (2015)
“For civil and commercial users, one possible impact of a smaller GPS constellation could be an increased use of other positioning, navigation and timing (PNT) services, including those expected to be offered through Europe’s Galileo system . . .”
Department of State asks for higher priority for US expert participation in international PNT activities, to ensure compatibility with GPS is maintained.