GPS Timing Data & Information

Timing Data for Individual GPS Satellites

• Standard Format format explanation
• Most Recent 1 Day
• Most Recent 7 Days [UNIX compressed format] [PC zipped format]
• Most Recent 30 Days [UNIX compressed format] [PC zipped format]
• Common View Format format explanation
• Most Recent 1 Day
• Most Recent 7 Days [UNIX compressed format] [PC zipped format]
• Most Recent 30 Days [UNIX compressed format] [PC zipped format]

Timing Data for Entire GPS Constellation

• GPS Time vs. UTC via USNO Master Clock: [Most Recent 30 Days] [Most Recent 180 Days]

Notice Advisories to NAVSTAR Users (NANUs)

• 2004 NANUs [NANU Number index] [Satellite Number index]
• Most Recently Issued NANUs
• Current Constellation Status, Planned & Recent Outages
• 2003 NANUs [NANU Number index] [Satellite Number index]
• 2002 NANUs [NANU Number index] [Satellite Number index]
• 2001 NANUs [NANU Number index] [Satellite Number index]
• 2000 NANUs [NANU Number index] [Satellite Number index]
• 1999 NANUs [NANU Number index] [Satellite Number index]
• 1998 NANUs [NANU Number index] [Satellite Number index]
• 1997 NANUs [NANU Number index] [Satellite Number index]
• 1996 NANUs [NANU Number index] [Satellite Number index]
• 1995 NANUs [NANU Number index]
• 1994 NANUs [NANU Number index]

General GPS Information

• GPS System Description
• Constellation Information
• Block I Satellites
• Block II Satellites
• Common-View Schedules
• Satellite Health Codes
• GPS Time Transfer Information

Links to Other GPS Web Sites

• Sources of GPS Data

  • Calculate GPS Satellites in View at any location
  • GPS Satellites in View at Naval Air Warfare Center
  • GPS Almanacs from U.S. Coast Guard NAVCEN
  • GPS & Glonass NORAD Orbital Elements
  • GPS Precise Ephemeris at National Imaging & Mapping Agency
  • NOAA's Space Environmental Data for navigational systems
  • International GPS Service for Geodynamics (IGS)
  • Satellite Performance Data at Jet Propulsion Lab
  
  

• Sources of GPS Information

  • Additional GPS Information: SA, DGPS, Leap Seconds, etc.
  • GPS Page at the US Coast Guard Navigation Center
  • Sources of GPS Receivers from GPS World
  • GPS Tutorials
  • University of Colorado
  • Trimble
  • Aerospace Corporation
  • GPS Joint Program Office (JPO)
  • Glossary of GPS Terms at GPS World
  
  

• Sources of GLONASS Information

• GLONASS Time vs. UTC via USNO Master Clock: [Most Recent 200 Days]
• GLONASS Page at the Coordinational Scientific Information Center (CSIC) of the Russian Federation Ministry of Defense

US Naval Observatory Home Page
What Time Is It? USNO Time Service Home Page
GPS Home Page at USNO