Re-posting of news release dated September 15, 2023
Dear Customers,
We would like to announce that GPS week number rollover for equipment is to occur on some of our GPS devices on 8th September 2024 or 3rd August 2025.
The subject models are designed to turn the clock back 19.6 years (23rd January 2005) and will continue to work incorrectly under normal use. However, there is no influence on positioning operation. As a result, the following abnormalities occur in some equipment:
- Some date information will be displayed erroneously.
- Communication function will not work properly.
*1 GPS week number rollover:
The week number counter in GPS resets once every 1023 weeks, which is approximately 19.6 years. The week number counters for the GPS in the objective equipment below started their week count from 23rd January 2005. It is on 8th September 2024 at 00:00 AM (UTC) that the week number counter rollover will occur.
1. Objective Equipment
1-1. Rollover date: 8th September 2024
- Inmarsat Fleet Broadband FB500 (JUE-500)
- GPS Navigator (JLR-7500/7600)
- GPS Receiver (JLR-4331W/4340)
- GPS Compass (JLR-20/30)
1-2. Rollover date: 3rd August 2025
- AIS (JHS-182/183)
- GPS Navigator (JLR-7800/7900)
- GPS Receiver (JLR-4341)
- GPS Compass (JLR-21/31)
2. Notice and Countermeasures
2.1. The rollover day is on the 8th September 2024 at 00:00 AM (UTC).
| Equipment | Models | Subject Serial No. | Notice | Countermeasures |
|---|---|---|---|---|
| Inmarsat Fleet Broadband FB250 | JUE-500 | All | The registration process to the Inmarsat network fails and communication becomes impossible. The date of the internal clock and log function of the device returns to the starting date. | Upgrade the software Confirmation method of JUE-500 software version |
| GPS Navigator | JLR-7500 | All | ||
| JLR-7600 | All | Note that time and date will go back to the starting date (January 23, 2005) when a master-reset of equipment or a battery replacement is carried out after rollover day. | Setting method of JLR-7500 Setting method of JLR-7600 Setting method of JLR-4331W Setting method of JLR-4340 Setting method of JLR-20/30 |
|
| GPS Receiver | JLR-4331W | After KE51719 | ||
| JLR-4340 | All | |||
| GPS Compass | JLR-20 | All | ||
| JLR-30 | All |
2.2. The rollover day is on the 3rd August 2025 at 00:00 AM (UTC).
| Equipment | Models | Subject Serial No. | Notice | Countermeasures |
|---|---|---|---|---|
| AIS | JHS-182 | JHS-182: after BB51401 NTE-182: after BB71401 |
Note that time and date will go back to the starting date (December 18, 2005) when a master-reset or restarting of equipment is carried out after rollover day. | Upgrade the software or JHS-183 replacement |
| JHS-183 | NTE-183: up to BE04000 NCM-983: up to BB04206 |
Upgrade the software | ||
| GPS Navigator | JLR-7800 | All | ||
| JLR-7900 | All | Note that time and date will go back to the starting date (December 18, 2005) when a master-reset of equipment or a battery replacement is carried out after rollover day. | Setting method of JLR-7800 Setting method of JLR-7900 Setting method of JLR-4341 Setting method of JLR-21/31 |
|
| GPS Receiver | JLR-4341 | All | ||
| GPS Compass | JLR-21 | All | ||
| JLR-31 | All |
For the software update, the corresponding cost will be charged.