j...@febo.com said: > Of course, many of the old units still work fine except for the rollover > providing a bogus date, and external software can easily correct that.
If you tell it the date, it will do the right thing. T2202202052354503000039 >From the status page: GPS 23:55:19 05 Feb 2022 --------- >From page 42 of Chapter 3 of the UT manual. ROLLOVERS IN TIME In August of 1999, the GPS week number will rollover from 1023 to 0 due to the limited length of the GPS week field in the navigation data stream. Motorola Oncore receivers (GT, UT, VP, XT, and Basic) have been designed and tested to properly distinguish the correct 20 year window (1024 weeks is just shy of 20 years). They will not need reprogramming or replacement come 1999. In fact, the transition will be completely transparent to users of Motorola Oncore GPS receivers. Motorola Oncore GPS receivers are also year 2000 compliant. Multichannel GPS satellite simulators have been used to test each rollover condition in GPS. For example, each week there is a rollover in the GPS seconds on midnight Saturday. The August 1999, year 2000, leap day, and leap second rollovers have all been successfully tested using simulators. In order to handle the 1999 rollover, Motorola GT and UT Oncore GPS receivers use a date stored in flash memory. For example, if the firmware date is 1996, a defaulted receiver that does not have back-up power (or battery) will start with an internal time of 12:00 on 1/1/96 and begin acquiring satellites. Once the first satellite is acquired, the time and week number will be downloaded from the navigation data message. The receiver determines the current date by starting from the week number of 1/1/96 (week 834) and searching for the first occurrence of the current week number (week 860 for 7/1/96). -- These are my opinions. I hate spam. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.