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Re: Hard or soft?


From: Gary E. Miller
Subject: Re: Hard or soft?
Date: Thu, 28 Mar 2024 12:22:37 -0700

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

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