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Department of Defense (DoD)

Department of the Air Force (USAF)

Air Force Space Command (AFSC)

GPS Support Center (GPSOC)

NAVSTAR GPS Directorate

PN&T Executive Committee

Department of the Navy (USN)

United States Naval Observatory (USNO)
EOP Products USNO - Primary
EOP Products Flagstaff - Backup
IERS Technical Notes

Coast Guard GPS Support (NANUs)

SpaceFlightNow Launch Schedule

National Institute of Standards and Technology (NIST)
Time & Frequency Division

Fundamental Physical Constants: NIST Constants/SI Units/etc.

The UK's National Physical Laboratory (NPL)

Institute of Navigation (ION)/Precise Time & Time Interval (PTTI)

University of Colorado at Boulder: GPS Overview

What Time Is It?: Your Time Is

Point of Contact: NGA Public Affairs
Phone Numbers:
  Com. (571)557-5400
  DSN 846-9140

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