Hello, I just read about the GPS week number rollover that will occur on April 6th, 2019. I had suffered it 1024 weeks ago, in August 1999, and forgotten about it since I don't use that GPS device anymore (it was a Garmin and got a firmware update).
What is it all about? In short, the GPS signal encodes the date as number of weeks plus number of seconds within the week. The week number is encoded using 10 bits: after 1024 weeks the counter rolls over to 0. The first week #0 was in 1980. The second in 1999. The third will be in 2019. If the GPS receiver has not been designed to use the newer 13-bit week number, or does not implement a software workaround, on April 7th (midnight UTC) it will begin returning a wrong date. Another effect is slower fix at powerup. There are lots of good web pages explaining WNRO. AFAIK there is no way to know if a receiver is affected, unless the vendor has published info about it. The NMEA output should be "assembled" by the GPS receiver firmware so it does not help. Some Nixie clock designs use GPS receivers to sync time, and they might be affected. The only way to know if the bug hits you is to wait few weeks. Paolo -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CABj2VaYrbSyHmUycVDME__rQXhVJZNo4Nimyu5zY2sUHbp84ZQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
