$GPGGA fix indicator field 6 has at least the following possible vaues: 0 no fix 1 GPS fix 2 DGPS fix
One reference [1] mentioned 3 GPS PPS fix and several reference 6 estimated or dead reckoning ntpd/refclock_nmea.c when using $GPGGA tests for 0 and declares the clock not in sync. When I read "estimated" or "dead reckoning" wonder if ntpd should consider the clock not of sync when it sees fix indicator 6. The gotcha that comes to mind is what if there are too few satellites in view for a good position fix but still enough for the time to be stable and accurate? I'm just reading code and inferring from what little I've found regarding fix indicator 6. GPS wisdom/reality check solicited. Cheers, Dave Hart [1] http://www.whtechtop.com/accessory/0183.pdf _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
