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be successful.
7.3.4 Monitoring & Controlling the GPS
The Global Positioning System is monitored and controlled by the U.S. Air Force, which is responsible
for updating and maintaining exact satellite position and signal data accuracy.
It is also responsible for performing maintenance on the satellites, which may require the satellite
being taken off-line. Since the system is subject to periodic updates and changes, the almanac data
broadcast by the satellites is current for a limited time — generally about 14 days.
7.3.5 GPS Information Sources
The needs of the worldwide civil GPS user community are served by the Civil GPS Information
Center (GPSIC) in Virginia. The GPSIC is operated and maintained by the U.S. Coast Guard for the
Department of Homeland Security.
Its primary function is to provide information on the Global Positioning System and satellite status
and to serve as a point of contact.
The GPSIC has general GPS literature available free upon request. The Center also maintains up-
to-date almanac data and Operational Advisory Broadcasts containing current constellation status
and planned satellite outages.
There are three ways to quickly obtain current information about the Global Positioning System
from the GPSIC:
1. Recorded phone message at (703) 313-5907
2. WebSite: www.navcen.uscg.mil
3. Live information at phone (703) 313-5900.
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