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Sat Nav GPS week number roll over.

Sparkingchip
An email from Tom Tom offering me a “good deal” on a new Sat Nav


The GPS Week Number Rollover (WNRO) occurs every 19 years, with the next roll over taking place on 6 April 2019. Similar to odometers in older cars rolling over from 99,999 km to 0, the GPS WNRO is the resetting of the GPS calendar back to 0. 


When the calendar resets, it can cause a miscommunication between GPS satellites and GPS receiver chips. As a result, some chips in satnavs will lose the ability to process certain functions. 


What does this mean for you? It’s time to check your satnav. Depending on your device, you may need to update or upgrade.


So that is why I cannot set the the time on my Tom Tom Sat Nav!


Andy
Parents
  • 0
    Out of curiosity, I got my old Garmin GPS 76 (which is at least twenty years old) out of the back of the drawer to see if it still worked correctly after the latest GPS week number rollover.


    To my surprise - it it still working fine, having now been through at least one one and possibly two GPS week number rollovers!


Reply
  • 0
    Out of curiosity, I got my old Garmin GPS 76 (which is at least twenty years old) out of the back of the drawer to see if it still worked correctly after the latest GPS week number rollover.


    To my surprise - it it still working fine, having now been through at least one one and possibly two GPS week number rollovers!


Children
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