[ntp:questions] help - clock jumps up to 5000 ms startup ntpd with usb gps linux
David J Taylor
david-taylor at blueyonder.co.uk.invalid
Sun Feb 19 17:10:16 UTC 2012
"unruh" <unruh at invalid.ca> wrote in message
news:Zu90r.3511$zA2.2177 at newsfe02.iad...
> On 2012-02-19, Rob <nomail at example.com> wrote:
>> Ron Frazier (NTP) <timekeepingntplist at c3energy.com> wrote:
>>> *GPS_NMEA(5) .GPS1. 0 l 4 8 37 0.000 563.733
>> Don't try to use NMEA for timesyncing! It will only drive you crazy.
> No. It is fine.
NMEA alone may be little better than Internet servers, it may be worse.
>> Some people are lucky and seem to be able to get a usable result, but
>> they really are working outside the specs and can get bitten at any
>> firmware change (as was recently seen with some Garmin firmware).
> Yes, you may have to recalibrate the offset after a firmware change. So?
The Garmin issue was more than a simple "recalibration required", but the
released a fix. "So" might be: "so use PPS as well as NMEA, both to
improve performance dramatically and reduce or remove the need for
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