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Re: FreeBSD Garmin 18x LVC receiver - precision -20

From: Gary E. Miller
Subject: Re: FreeBSD Garmin 18x LVC receiver - precision -20
Date: Fri, 16 Oct 2020 10:29:07 -0700

Yo Philippe!

On Fri, 16 Oct 2020 12:11:51 +0200
"Philippe Maechler" <> wrote:

> I'm running my own ntp server and will now install a gps receiver to
> let my server be more accurate


> gpsd:INFO: KPPS:/dev/cuau0 kernel PPS will be used

KPPS installed.  Good.

> gpsd:INFO: PPS:/dev/cuau0 Assert hooks called clock:
> 1602842711.000178108 real:  1602842711.000000000: accepted

KPPS working.  Good.

> My interpretation is, that the receiver is connected to 9 satellites
> but still does not get an accurate time ("precision":-20)

You realize that "precision" is a constant?  All PPS time is "-20".
It tells you nothing.  You want to look at the ntpd jitter.  Or better
yet, install and run ntpviz.

> All in all my ntp server does not get time data from PPS (?). ntpq
> tells me, that its not reachable. But I'll get to this when I'm sure
> that gpsd is working

You did not share important info:

What does ntpshmmon tell you?

What is your ntp.conf

> Any help or insight are appreciated

Did you read the time howtos?

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