Got a GPS?
Welcome to week zero - from the
Furuno Website:
Important notice to our customers who use FURUNO GPS receivers for marine use that are affected by GPS week number rollover.
We thank you very much for your trust and continued support.
It is regretful to announce that there is a possibility that some of our GPS receivers and GPS-incorporated equipment (please see the list below) may face GPS positioning errors after 11th of August 2013, due to the problem of GPS week number roll-over. If you happened to spot any GPS positioning error on the equipment listed below, we would like to ask 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.
A bit more detail:
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". This rollover occurred to some of the GPS receivers listed above on the 11th of August 2013, and the week number was reset to the week 0, that is, 26th of December 1993. 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.
My three units just checked out fine but I am on an email list dedicated to precise time keeping and many people are having this problem.
Posted by DaveH at August 11, 2013 3:16 PM