GPS Timing Data and Information

Coordinated Universal Time (UTC) Time Step (Leap Second)

As of July 1, 2012, GPS is ahead by sixteen (16) seconds.

Dual-frequency GPS Data in RINEX format from the CDDIS data ftp server

1. Yesterday's RINEX observation files for USNO receivers (in UNIX compressed format)
2. Note: This data ftp service and these receivers are not controlled by USNO
3. RINEX format conversion code (in C): to CGGTTS format and to CGGTTS and USNO formats

Timing Data for Individual GPS Satellites (Single frequency C/A code)

• USNO Format format explanation

1. Most recent 1 Day
2. Most recent 7 Days    [UNIX compressed format]   [PC zipped format]
3. Most recent 30 Days  [UNIX compressed format]   [PC zipped format]

• CGGTTS Format (Common View) format explanation

1. Most recent 1 Day
2. Most recent 7 Days   [UNIX compressed format]  [PC zipped format]
3. Most recent 30 Days [UNIX compressed format] [PC zipped format]

• GPS Time vs. UTC via USNO Master Clock

1. Most recent 30 Days
2. Most recent 180 days

Notice Advisories to NAVSTAR Users (NANUs)

• 2013 NANUs [NANU Number index] [Satellite Number index]

1. Most Recently Issued NANUs
2. Current Constellation Staus, Planned & Recent Outages

• 2012 NANUs [NANU Number index] [Satellite Number index]
• 2011 NANUs [NANU Number index] [Satellite Number index]
• 2010 NANUs [NANU Number index] [Satellite Number index]
• 2009 NANUs [NANU Number index] [Satellite Number index]

General GPS Information

• GPS System Description
• Constellation Information
• Current Satellites
• Block II Satellites 
• Satellite Health Codes
• GPS Time Transfer Information

Links to Other GPS Data Sources

• CDDIS GPS Archive from NASA's CDDIS ftp server

• The International GNSS Service (IGS)

• GPS Almanacs from U.S. Coast Guard NAVCEN

• GPS & Glonass NORAD Orbital Elements

• NOAA's Space Environmental Data for navigational systems