What is GPS WRNO?
This is the flaw of original GPS system design which keeps week numbers only up to 1023 and then wraps back to 0, causing GPS receiver time jump back by around 19.7 years. Modern GNSS receivers implement various mechanisms to handle the rollover and will operate normally after rollover has happened. Older GPS receivers used certain known date (usually firmware build date) to differentiate past from future, which helped to continue reconstructing correct date a number of years after actual rollover until the so-called cutoff date when date will jumps back.. The cutoff date for the GPS receiver used in your device is October 11, 2025.
What is affected?
Once the cutoff date is reached the device might freeze and require reboot to continue operation.
After the reboot the device continue its normal operation with the following exceptions:
- The displayed date will be wrong (March 2006)
- Traceability data before the cutoff date will not be accessible in reports, but not lost. Traceability reports will have wrong dates from the past.
How to fix?
The issue can be fixed by replacing the GPS receiver inside your device with the one running the latest firmware
You have a few options. You can send the unit to Fluke for repair. You can contact Pendulum and purchase an updated receiver to replace yourself. Or you can send the unit to Pendulum's factory in Poland and they will repair if for you.
To send the unit to Fluke please follow this link: Return for service: online RMA and service quotes
To purchase a new receiver from Pendulum or to send the unit to Pendulum in Poland, please email their service team at service@pendulum-instruments.com