We thank you very much for your trust in and continued support for our products and services.
It is regretful to announce that there is a possibility that some of our GPS products (please see the list below) may face GPS errors after the 17th of March 2019, due to the problem of GPS week number rollover. If you happened to spot any errors on the equipment listed below, we would like you to take the following countermeasures to resolve the problem. If the problem persisted after having taken the countermeasures, please consult with our sales representative closest to your location. We sincerely apologize for all the inconveniences caused.
|Type of Equipment||Model|
|Inmarsat-C mobile earth station||FELCOM12 / FELCOM12-ALC|
|Radar plotter sounder||RS-1000A / RS-1000C / FRS-1000A / FRS-1000B / FRS-1000C|
|Color video plotter||GD-280 / GD-380 / GD-680|
|GPS plotter||GP-1600 / GP-1810 / GP-1610C / GP-1650 / GP-1850 / GP-280 / GP-3210 / GP-380 / GP-680|
|GPS/plotter/sounder||GP-1600F / GP-1610CF / GP-1650F / GP-1810F / GP-1850F|
|DGPS plotter||GP-1650D / GP-1850D|
|DGPS plotter/sounder||GP-1650DF / GP-1850DF|
|GPS receiver||GP-310B (serial no. 3453-4870 to 5686)|
|GPS navigator||GP-31 / GP-80 (serial no. prev. to 3457-3275)|
NOTE: The date specified above is the date in which week number rollover occurs in our products listed above, and the date is independent from the one announced by the US Department of Homeland Security, namely, the 6th of April 2019, which is the date when GPS week number rollover occurs in the GPS as a system per se. The difference stems from different initial dates of counting week between GPS system and the GPS chipset used in our products.
The GPS system is synchronized to a different time scale than Coordinated Universal Time (UTC) and calculates time by counting the number of weeks up to 1,023rd week.After week 1,023, the week number count is reset to zero. This is called "GPS week number rollover". Subsequently, the erroneous date information on the GPS receiver clock may result in instability in positioning, causing position errors, including failure of GPS position acquisition, etc.
Please carry out the following counter measures:
If the GPS product is interfaced with any of the following equipment and systems, the countermeasures would have to be taken, for the date information is utilized by the interfaced equipment and systems.
For further information and consultation, please contact your nearest point of contact of FURUNO.