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GPS Timing Data and Information

Note: Many of the links on this page have been disabled until a new cloud-based hosting service can be established.
We apologize for the inconvenience this may cause.


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

As of January 1st, 2017, GPS will be ahead of UTC by eighteen (18) seconds.


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

  1. Note: This data ftp service and these receivers are not controlled by USNO
  2. 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)

  1. Most recent 7 Days    [UNIX compressed format]   [PC zipped format]
  2. Most recent 30 Days  [UNIX compressed format]   [PC zipped format]
  1. Most recent 7 Days   [UNIX compressed format]  [PC zipped format]
  • GPS Time vs. UTC via USNO Master Clock

Notice Advisories to NAVSTAR Users (NANUs)

  1. Most Recently Issued NANUs
  2. Searchable Archive of Current Year NANUs
  3. Archive of NANUs, Almanacs, and OPS Advisories, from 1997 to present
  4. Current Constellation Status, Planned & Recent Outages

General GPS Information

Links to Other GPS Data Sources


Commander, Naval Meteorology and Oceanography Command | 1100 Balch Blvd. | Stennis Space Center, Mississippi 39529

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