[time-nuts] Old NMEA GPS units with week rollover bug

Mark Sims holrum at hotmail.com
Sat Apr 22 18:01:06 EDT 2017

If you can find an old Trimble SV6, those all rollover.  They are rather limited in the NMEA strings that they output.  Most of the early Motorola 6 channel devices have also rolled over.

Or wait until 29 July 2017 and the Thunderbolt rolls over.  The Tbolt does not output NMEA,  but Lady Heather now has a mode that can generate and echo a NMEA stream from any of the GPS receivers it supports.

The Ublox receivers have a command that lets you set the GPS week.  I don't know if they let you set a week that is before the firmware creation date.   Unfortunately, Heather does not have a way of sending that command.  Perhaps U-Center does?


> I'm looking for one for testing software.  Does anybody know a model that has 
this problem and/or know where I can get one?

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