The world-wide GPS system once every 20 years Week Number Roll Over happened last night.
Per the good folks at Garmin:
https://support.garmin.com/ms-MY/?faq=zWQY6Z2kFiAuY9kDnDBgZ6
My portable TomTom car unit also needs a software update:
https://www.tomtom.com/en_us/updates/
Thanks for the reminder. Just came in from testing my old approach certified GX60 and my old Garmin 396. Both are working as they were on the last flight.
I just set my 396 on the back of the tractor outside the shop & turned it on. The internal battery has been dead for ages but it "found itself" and had the correct date & time within a couple minutes.