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Civil GPS Service Interface Committee

Timing Subcommittee

This page provides information about the Timing Subcommittee of the Civil GPS Service Interface Committee (CGSIC).


  • To determine the requirements and needs of the civilian timing community for GPS information.
  • To determine the sources of GPS timing information.
  • To determine the methods by which GPS timing data will be disseminated.

View charter


The subcommittee includes civil users who are involved in national and international timing centers, who use time for synchronization of systems, and who require time for distinguishing events recorded by data acquisition systems.

Subcommittee Officials

Dr. Patricia Larkoski
The MITRE Corporation
Deputy Chair:
Dr. Bijunath Patla
National Institute of Standards and Technology (NIST)
U.S. Department of Commerce

Resolution on UTC

In September 2014, the Timing Subcommittee prepared a resolution recommending the elimination of leap seconds from Universal Coordinated Time (UTC).

The CGSIC Executive Committee endorsed the resolution and delivered it to the Chair of the International Telecommunications Union (ITU) Working Party 7A (WP7A).

View resolution


The Timing Subcommittee meets once a year during the annual meeting of the full CGSIC.

62nd CGSIC Meeting

The full Civil GPS Service Interface Committee is scheduled to convene in Denver, Colorado, and online on September 19-20, 2022, in conjunction with the ION GNSS+ 2022 conference.

View agenda

Previous Meetings

Presentation materials from the past few meetings of the Timing Subcommittee are included in the meeting records of the full CGSIC.

The following links lead to other pages and websites providing information about GPS timing. Some of these links lead away from

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