On 2012-02-19, Rob <[email protected]> wrote: > Ron Frazier (NTP) <[email protected]> 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. > > The timestamp in NMEA is a "time of last fix", not the current time. And ntpd allows you to alter the offset timestamp to account for the delay in the end of the nmea message coming through. That it uses the end of the message rather than the beginning causes excess jitter, but that is never anywhere near 5000ms. > > 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? _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
