GPS Week Number Rollover 2025 – Ensuring Reliable System Synchronization
Every ~19.6 years, GPS receivers experience a week counter reset, known as the GPS week number rollover. This is due to the limited counter size used in GPS signals, which resets after 1024 weeks. This event can have an impact on devices that rely on GPS for accurate date and time synchronization throughout the world.
In September 2025 and December 2025, the next rollovers occur. Some MOBATIME devices are affected. We are sharing this information to ensure you remain fully prepared and can take the necessary steps.
Devices affected
The following MOBATIME products are impacted by the GPS week rollovers:
GPS 4500 V1 (Article no. 201821 & 202327, sold in 2014 and earlier) → rollover on 13 September 2025
GNSS 3000 V1 → rollover on 25 December 2025
GNSS 3000 V2 (with GNSS module older than V4.x, e.g. V3.1) → rollover on 21 December 2025
Important note for GNSS 3000 V2:
Module revision v02.x, v3.x (delivered until approx. 2015) → rollover on 25 December 2025
Module revision v4.x, v5.x → rollover in October 2030
Other future rollovers
- GU 192 V2 (firmware v1.04.00) → rollover on 17 June 2028
- GPS 4500 V2 → rollover in 2031
- GU 192 V2 (firmware v1.07.07) → rollover on 25 September 2038
- GNSS 4500 (firmware v02.00) → rollover on 17 September 2039
- GNSS 4500 (firmware v03.00) → rollover on 02 May 2043
Next Steps & Recommendations
Devices affected by the rollover should be replaced before the respective rollover date to guarantee the proper synchronization of your connected systems.
Due to hardware limitations, updates are not feasible.
Our MOBATIME support team can assist you in identifying your product version and recommending suitable replacement solutions.
For questions or direct support, please contact us at: [email protected]
