Harald Brinkmann wrote: [] > But even problems caused by a slow data transmission wouldn't explain > why the observed offset is small compared to one second most of the > time (and in my case continuously for well over a year) and suddenly > and only on certain days there is an offset of almost exactly one > second, unless the messages are suddenly and only on those days > extraordinarily long and just happen to delay everything by one > second. I'll have a lookout for the raw NMEA messages the next time > this happens. *If* I were using a PPS signal, I could understand the > system being confused about which NMEA message belongs to which PPS > pulse, so one would get an offset of (maybe multiples of) one second. > But that's not the case here. > > Harald
No, indeed. Hal's graph shows it nicely. I have a SiRF III chip set equipped GPS (Garmin GPS60 CSx), but it doesn't display the seconds (or is there a screen where it does?). One casual check suggested that it changed from 06:20 to 06:21 UTC at about the expected instant, using the clock on the map display screen, but I've done no systematic checks. I do hope you get to the bottom of this. Cheers, David _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
