On 2009-02-11, [email protected] wrote: > I'm using a Garmin 18 LVC connected using LinuxPPS with mostly good > results. I am curious about one thing though. The offset reported by > the GPS18 differ from the public NIST servers by around 1.7-1.9MS. as > shown in the offset numbers of ntpq below. > > remote refid st t when poll reach delay offset jitter >================================================================== > *GPS_NMEA(0) .GPS. 0 l 4 16 377 0.000 -0.448 0.189 > +bigben.cac.wash .USNO. 1 u 34 1024 377 11.134 0.283 2.645
The offset difference in your _snapshot_ is only 0.731 milliseconds. If you wich to calculate a correction value you need to look at the statistics over the long term. Enable statistics collection, let ntpd run for a few days, and use the peer.awk script from the ./scripts directory of the NTP Reference Implementation Distribution to summarize your peerstats file. -- Steve Kostecke <[email protected]> NTP Public Services Project - http://support.ntp.org/ _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
