[ntp:questions] garmin 18x and linux

Miroslav Lichvar mlichvar at redhat.com
Mon Sep 5 15:33:40 UTC 2011

On Mon, Sep 05, 2011 at 03:04:54PM +0000, unruh wrote:
> On 2011-09-05, Miroslav Lichvar <mlichvar at redhat.com> wrote:
> > With 18x LVC (firmware 3.70) I see errors up to 150 ms. That
> > wouldn't be that bad if it was randomly distributed.
> >
> > A capture over 30 hours:
> > http://mlichvar.fedorapeople.org/tmp/18x_nmea.png
> This was captured how? Is that the beginning or the end of the nmea
> sentence?
> You have some where the offset is negative. Does this really mean that
> the nmea came in before the beginning of the second it referred to?

No, I forgot to mention that was already with 0.5s correction applied.
It's from gpsd which seems to make the NMEA receive timestamp after
the message is processed.

Miroslav Lichvar

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