kb8tq@n1k.org said: > If you have a very good survey grade receiver and take a long enough data > set, yes you can watch your location drift in some parts of the world. In > most locations, fixes a few years apart would be a better bet. I'm in Silicon Valley. The San Andreas fault is a few miles from here. A map of the bay area will show a dozen major faults. A neighborhood map may have several smaller lines. https://earthquake.usgs.gov/earthquakes/events/1906calif/virtualtour/bayarea .php The USGS has good GPS receivers sprinkled around the area. You can see occasional antenna domes on a post alongside the highway. http://www.quake.geo.berkeley.edu/usgs-gps/ (Time sink warning.) The fault moves about as fast as your fingernails grow, an inch per year. That's one side relative to the other. I don't know how fast the pair is moving. -- These are my opinions. I hate spam.

Hi …… and the quoted errors are in the 10’s of cm range. Thus you need a few years, even if you are moving an inch per year. Bob > On May 3, 2018, at 2:19 PM, Hal Murray <hmurray@megapathdsl.net> wrote: > > > kb8tq@n1k.org said: >> If you have a very good survey grade receiver and take a long enough data >> set, yes you can watch your location drift in some parts of the world. In >> most locations, fixes a few years apart would be a better bet. > > I'm in Silicon Valley. The San Andreas fault is a few miles from here. A > map of the bay area will show a dozen major faults. A neighborhood map may > have several smaller lines. > https://earthquake.usgs.gov/earthquakes/events/1906calif/virtualtour/bayarea > .php > > The USGS has good GPS receivers sprinkled around the area. You can see > occasional > antenna domes on a post alongside the highway. > http://www.quake.geo.berkeley.edu/usgs-gps/ > (Time sink warning.) > > The fault moves about as fast as your fingernails grow, an inch per year. > That's one side relative to the other. I don't know how fast the pair is > moving. > > > > -- > These are my opinions. I hate spam. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.