Global Positioning System Data & Information

maintained by the

United States Naval Observatory

Timing Data for Individual GPS Satellites

• Standard Format format explanation
  • Today's
  • Last 7 Days
  • Last 3 Months
  
  
• Common View Format format explanation
  • Today's
  • Last 7 Days
  • Last 3 Months
  
  
• Day of Year (DOY) Format
  • Today's
  
  
• Graphs of UTC(USNO)-GPS as reported by Individual Satellites
  
  
• GPS Daily Time Differences (USNO Time Service Series 4)

Timing Data for Entire GPS Constellation

GPS Time vs. UTC via USNO Master Clock: UTC(USNO MC) - GPS



Graphs of UTC(USNO MC) - GPS values for the past 30 days

Notice Advisories to NAVSTAR Users (NANUs)

1998 NANUs

• Most Recently Issued NANUs
• Current Constellation Status, Planned & Recent Outages
• Outages Listed by Satellite Number (year to date)
• Issued during the First Quarter of 1998 (listed by NANU number)
• Issued during the Second Quarter of 1998 (listed by NANU number)
• Issued during the Third Quarter of 1998 (listed by NANU number)

• 1997 NANUs
  • Listed by NANU number
  • Listed by Satellite Number
  
  
• 1996 NANUs
  • Listed by NANU number
  • Listed by Satellite Number
  
  
• 1995 NANUs
  
  
• 1994 NANUs
  
  

USNO STel 502 GPS Receiver Schedules

Entire Daily Schedule


Common View Portion of Daily Schedule

General GPS Information

GPS System Description


Constellation Information

• Block I Satellites
• Block II Satellites

Satellite Health Codes


GPS Time Transfer Information


Sources of GPS Receivers

Links to Other GPS Web Sites

• Sources of GPS Data
  

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

  
  
  

  Sources of GPS Information

  • GPS Page at the US Coast Guard Navigation Center
  • General GPS Information at USNO
  • GPS Tutorials
    • University of Texas
    • Trimble
    • Aerospace Corporation
  • GPS Joint Program Office
  • Glossary of GPS Terms at GPS World

• Sources of GLONASS Information
  • MIT Lincoln Laboratory GLONASS Group
  • GLONASS Page at the Coordinational Scientific Information Center (CSIC) of the Russian Space Forces (RSF)

Survey: Please give us your comments regarding your use of GPS timing and common view data.

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

Send questions or comments to: lss@ramsey.usno.navy.mil