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External Links
GPS/PNT Information
- National Space Based PNT Coordination Office
- www.GPS.gov
- U.S. Coast Guard Navigation Center (NAVCEN)
- Global Positioning Systems Wing
- GPS Public Interface Control Documents
- International Committee on GNSS (ICG)
- ICG Providers Forum
- Institute of Navigation (ION)
- GPS Applications Exchange (NASA)
- GPS Education Page at the National Oceanic and Atmospheric Administration (NOAA)
- GPS Homepage at the U.S. Naval Observatory (USNO)
- GPS Education Page at the National Park Service
- GPS Homepage at the USDA Forest Service
- GPS Education Page at Smithsonian Institution
GPS Augmentation Systems
- Wide Area Augmentation System (WAAS) and Local Area Augmentation System (LAAS)
- WAAS Status and Performance
- Maritime Differential GPS System (DGPS)
- Nationwide Differential GPS System (NDGPS)
- U.S. Continuously Operating Reference Stations (CORS)
- Global Differential GPS System (GDGPS)
- International GNSS Service (IGS)