GPS Week Number Rollover [WNRO] JUST Findings, Fixes, and Frustrations

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If you get access by shell, you should be able to use "cat /var/run/gpspipe" and read the NMEA messages. I suspect the chip is providing a wrong date, 19.7 years ago. At least this was the case on my Rider 2013, but with AR1520 GPS chip.
In theory it should be possible to intercept the fopen call to the gpspipe fifo by the navigation software, read the data coming from gpspipe, detect the wrong date, correct it, feed it back into the navigation software, and be happy.
On the Rider 2013 it's a bit simpler, because you can just tell the GPS driver which fifo to use and then write a bridge-application. That's what I did, unfortunately that won't work on GL1 devices. Already checked that. "gltt" provides no option to specify the output fifo.

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Even though I told you first you need an alternative software, I did it for my Rider 2013 myself now. You need BTconsole, and then you can connect to the shell via Bluetooth. I used that a lot to produce a fix for my Rider 2013.

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Thats right.

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So you got a working Rider 2013 by inserting a new app between sw "ingsvcd" and NavCore ???

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Really?
The gpspipe is created by the init script, but the name is hardcoded in gltt and PNDNavigator.
You cannot open the connection between pipe and PNDNavigator or between ttgps and pipe.
(AFAIK)
Q: pls provide a sample code to do this.

Next task is to add 1024 weeks to get the right date. Not that simple, because there are leap years to take in account.

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definitely

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agreed

$GPRMC is the ONLY NMEA-message that contains wrong data (date is ddmmyy with yy is 99 in these days).
All other messages are correct on my One 2nd edition.