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

[Gary E. Miller]

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 
stability.

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

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