Problem with GPSD refclock

Gary E. Miller gem at
Mon Jan 30 20:05:33 UTC 2017

Yo Rich!

On Sun, 29 Jan 2017 19:31:10 -0800
Rich Wales <richw at> wrote:

> Gary E. Miller wrote:
> > No, setting a good fudge on the NMEA time is a bad thing.  You only
> > want ntpd to use SHM(1) as a last resort.  If you know you have
> > good network time as a backup then set SHM(1) to noselect.  
> I'm confused here.

My mistake.  Just testing if you are awaake.  :-)

> First of all, did you really mean to say "SHM(1)" in the above?  My
> understanding was/is that SHM(1) is the GPS's NMEA time info combined
> with the PPS signal (and will therefore normally be highly accurate),
> and SHM(0) is raw NMEA without PPS (very inaccurate with high jitter).

You are correct, I meant noselect on SHM(0).

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at  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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