Re: Hard or soft?

[Håkan Elmqvist]

Thanks,
it is encouraging to see that there still exists people who know their ways.

My gpsd is:
he@x22:~$ gpsd -V
gpsd: 3.22 (revision 3.22)
running on ubuntu 22.04 installed with apt a day before writing to 
gpsd-users.

Do you believe that getting a later version, say gpsd-3.9.tar.gz will 
fix this little problem.
When I bought this device, must have been around 2004, I used it on my 
boat with a Windows computer without any problems.
Now the Russians are tampering with our GNSS, so I thought I would just 
use the device to continuously monitor GPS-quality.
Kind regards
Håkan


Den 2024-03-28 kl. 20:22, skrev Gary E. Miller:
> Yo Håkan!
>
> On Wed, 27 Mar 2024 13:37:54 +0100
> Håkan Elmqvist <hakelm@smeden.org> wrote:
>
> > I have an old usb-gps receiver labelled navibe GM-720 (see below for
> > lsusb ID).
> the USB ID is just for a plain vanilla USB to serial chip.  A quick
> google finds the manual:
>
> https://www.manualslib.com/manual/1164358/Navibe-Gm720.html?page=3#manual
>
> It is a SiRF Star III chip.  Nice in its day.
>
> > Together with gpsd and gpspipe it seems to work properly
> > with one exception: today (2024-03-27) the date is reported as
> > 2043-11-11, time of day is, however, correct.
> > Could this be a software error or is it a hardware problem?
> Neither, it is a firmware error in the GPS chip.  Caused by
> GPS Week Number Rollover.
>
> https://en.wikipedia.org/wiki/GPS_week_number_rollover
>
> Just look at your NMEA.
>
> > Is there any tool I could use to find out?
> No need.  Almost all GPS receivers have this bug.  Often fixed by
> a firmware update, but since SiRF was bought, no chance of that.
>
> https://en.wikipedia.org/wiki/SiRF
>
> Qualcomms record for support is very bad.
>
> What version gpsd do you have?  Newer versions should correctt the
> date for you.
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
>         gem@rellim.com  Tel:+1 541 382 8588
>
>             Veritas liberabit vos. -- Quid est veritas?
>      "If you can't measure it, you can't improve it." - Lord Kelvin

--
Håkan Elmqvist
Sunnerdahlsv 7
167 62 Bromma
Telefon: +46 (8) 80 18 81, +46 (704) 56 74 81, +46 (176) 84 077
epost: hakelm@smeden.org

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