Spectra Geospatial – GPS Rollover


The world did not come to an end Saturday, April 6 when the 10-bit calendar week in the GNSS timing algorithm rolled back to 0000000. The first “Week O” was on January 6, 1980 at 00:00:00 UTC. This also means that every 19.7 years (1024 weeks), there is a reset to 0 of the week number count which will cause all GPS receivers report erroneous UTC and significantly degrade performance.

We are pleased to report that Duncan Parnell received very few calls from customers on this matter. The long- anticipated reset of the GPS calendar placed in motion a valiant effort by Trimble and Spectra Precision in coordination with Duncan Parnell to reach out to customers and mitigate this event. Please feel free to give us a call if you have not had an opportunity to ascertain the latest compliant firmware or if you just need to know if your GNSS receiver will function properly.

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