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Some Furuno GPS models had an internal rollover on January 2nd this year. If the equipment was not updated with the latest software version, the equipment's date will no longer be displayed correctly.
The GPS system’s time and date is synchronized according to a different scale than coordinated universal time (UTC). The GPS date is calculated based on a known start date and an interval of 1023 weeks. After 1023 weeks, the date is reset to the first date in the system’s week 0. When this happens in the satellite system it is often referred to as an external GPS week number rollover. In addition, all GPS receivers have their own internal week number rollover that follows the same principle, but with a different date as their first date in their week 0. Newer GPS receivers usually handle both the external satellite system’s rollover and the internal rollover in their own software. Older models may need specific software update, or replacement if software update is not possible.
INTERNAL ROLLOVER FOR SPESIFIC FURUNO GPS RECEIVERS 02.01.2022
Some Furuno GPS models had an internal rollover on January 2nd this year. The table below provides an overview of equipment models that may have been affected. If the equipment was not updated with the latest software version, the equipment's date will no longer be displayed correctly. For most models the solution is to upgrade to the latest version. Other types of malfunctions may also occur. In that case, a cold start or a memory clear procedure can usually solve the problem.
Please note that equipment showing and outputting the wrong date loses its status as type approved equipment, meaning the vessel might not fulfil the carriage requirements.
AFFECTED EQUIPMENT
The table below provides an overview of affected models as well as the earliest software version that will correct the issue. For some of the equipment, the effect of rollovers is limited to older serial numbers, as indicated. If you need a software update, please contact to have an onboard service arranged.
FULL OVERVIEW OF FURUNO ROLLOVERS|
Affected model |
Affected serial no. |
Software version which solves the problem. |
| GPS GP-80 | All | No Software available. Exchange Product. |
| GPS GP-90 | All | No Software available. Exchange Product. |
| GPS GP-150 | All | V.04.05 and higher Note: Only for GPS program number 4850264*** and 4850296*** |
| AIS FA-150 | All | 4.07 and higher |
| INMARSAT C FELCOM 15 | All | 1650159-05.07, 1650159-03.13, 1650159-03.63 |
| INMARSAT C FELCOM 16 | All | 1650160-05.05, 1650160-03.11, 1650160-03.61 A Laptop and special software is needed. Ask Service. |
| INMARSAT C FELCOM18 | 4507-4045 and before | 1.20 and higher NOTE: SW can not be checked by crew |
| INMARSAT C FELCOM19 | 3599-2507 and before | 1.20 and higher NOTE: SW can not be checked by crew. A Laptop and special software is needed. Ask Service. |
| Satellite compass SC-50/110 | All | 2.02 |
| GPS based speed log GS-100 | All | 3.03 |