I monitored Garmin LVC (corrected firmware) NMEA time and saw variance of up to 50msec. I wonder if the variation in NMEA time depends on GPS signal quality.
On Fri, Sep 2, 2011 at 11:19 PM, unruh <un...@wormhole.physics.ubc.ca>wrote: > On 2011-09-02, David Woolley <david@ex.djwhome.demon.invalid> wrote: > > Rob wrote: > > > >> > >> You will find (you have found) that by posting on this group, your > message > >> falls into the hands of a small group of people that will either base > >> all their solutions on much more stringent requirements than you > actually > >> have (e.g. they don't consider using GPS serial messages because it is > >> not possible to have millisecond precision with that), or they go on an > >> on about how the requirements you post cannot be achieved at all and > should > >> be relaxed or be realized with atom clocks etc. > > > > NTP isn't designed to work at accuracies worse than a few 10s of > > milliseconds. > > ?? Where does this come from? While it is true that there is the 128ms > rule ( which I believe can be adjusted) but where is this coming from? > And besides, Garmin GPS nmea can control to better than 10ms. > > _______________________________________________ > questions mailing list > questions@lists.ntp.org > http://lists.ntp.org/listinfo/questions > _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions