[ntp:questions] garmin 18x and linux

Miroslav Lichvar mlichvar at redhat.com
Mon Sep 5 13:25:05 UTC 2011


On Sat, Sep 03, 2011 at 08:05:21AM -0500, steven Sommars wrote:
> I monitored Garmin LVC (corrected firmware) NMEA time and saw variance of up
> to 50msec.  I wonder if the variation in NMEA time depends on GPS signal
> quality.

I'm wondering what is the cause of the variance too.

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

-- 
Miroslav Lichvar



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