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Re: [gpsd-users] Garmin 18X-5Hz

From: Gary E. Miller
Subject: Re: [gpsd-users] Garmin 18X-5Hz
Date: Thu, 11 Aug 2016 12:19:46 -0700

Yo Miroslav!

On Thu, 11 Aug 2016 16:07:06 +0200
Miroslav Lichvar <address@hidden> wrote:

> > > Is this any problem for gpsd and time synchronization?    
> > 
> > On theory, no.  In practice, never tested.  
> gpsd supports detection of 5 Hz PPS, but there is a problem that it
> always sets the fractional part of the timestamp to zero, so with 5 Hz
> PPS the offsets have an error of 0.0, 0.2, 0.4, 0.6 and 0.8 seconds.

Ouch.  If we can get a real test case that should be easy to fix.

OTOH, ntpd will not accept time corrections faster than every 8 seconds
without a patch.  I find that every every 16 or 32 seconds gives better
results.  Even longer may be even better, depending on local clock 

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

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