GPS Leap Second
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on 20 April 2015 09:36 AM

We have received some inquiries with regards to how the upcoming addition of the Leap Second (scheduled June 2015) will effect HYPACK users:

USCG - GPS Leap Second issues

The USCG Navigation Center (NAVCEN) issued a notice [located at] stating that on or about 21 January, GPS satellites began including future leap second data in routine navigation messages. The next leap second is scheduled for the end of June. Several GPS receiver brands/models seem to be mishandling this information and applying the leap second now. This is causing synchronization issues. Users experiencing issues with GPS receivers that began on or about 21 January should contact the manufacturers to determine whether a patch is available. (2/2/15).

There is a potential issue that relates to GLONASS users that are actively working when the additional second is applied to the GPS constellation.  If you are using GPS only, you should not be effected.  However, GNSS users should mindful of their systems after the change.  In short, when the GPS leap second occurs, one of two things will happen:

1- Nothing.

2- You get a sync error in HYPACK.  Solution? Reboot your hardware.


As always, we are here to help. Please contact us with any questions.