GPS Timing Data and Information
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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
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Note: This data ftp service and these receivers are not controlled by USNO
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Timing Data for Individual GPS Satellites (Single frequency C/A code)
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GPS Time vs. UTC via USNO Master Clock
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Notice Advisories to NAVSTAR Users (NANUs)
- Most Recently Issued NANUs
- Searchable Archive of Current Year NANUs
- Archive of NANUs, Almanacs, and OPS Advisories, from 1997 to present
- Current Constellation Status, Planned & Recent Outages
General GPS Information
Links to Other GPS Data Sources