GPS Information Links

National Space-Based Positioning, Navigation, and Timing (PNT) Coordination Office
  PNT GPS website
Selective Availability Information (02 MAY 2000)
  U.S. Coast Guard Navigation Center
  National Space-Based Positioning, Navigation, and Timing (PNT) Executive Committee
Differential GPS (DGPS) Information
When is the next UTC Leap Second?
  IERS Bullentin C (Leap Second Announcement)
  USNO Time Service Announcment Series 14 (Leap Second Announcement)
  GPS Notice to Navigation Users (NANU) regarding the UTC Leap Second
GPS Week Number Rollover

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