A word of caution here, though. Some GPS receivers do not update their displays on the second and so there might be a fraction of a second delay in the displayed time. GPS receivers with a 1 pps output provide a pulse on the second with the timing accuracy mentioned below when the receiver is tracking satellites. -- Richard Langley Professor of Geodesy and Precision Navigation
On Mon, 1 Feb 1999, Bob Haselby wrote: >Fernando, Your GPS is probably as good as it gets as far as time >accuracy is concerned. However your unit must be tracking or have been >locked on recently. The internal clock does not have very good long > term accuracy by itself. Actual time from the gps is accurate in the >microsecond level. We use gps recievers to syncronize computer networks. > >Bob > >Fernando Cabral wrote: >> >> Hello >> >> >From time to time I set my watch based on the time given by my >> Garmin G38. My watch seems quite good in the sense that after >> several weeks of even months it is showing about the same >> time the GPS is showing. >> >> Nevertheless, I don't know how accurate my GPS is. Is there >> a "standard" error or deviation or something like this? How precise >> can I expect my GPS to be? >> >> - fernando >> >> PS - It does not seem I can tune to any reliable source of time information >> here in Bras?lia. Also, I've tried several different programs in my windows >> environment to set my computer clock according to some of the >> well-known atomic clocks in the Internet. Nevertheless, it does >> not seem the software are good enough. I've found difference of up >> to 25 seconds amongst them. >> >> -- >> Fernando Cabral Padrao iX Sistemas Abertos >> mailto:[EMAIL PROTECTED] http://www.pix.com.br >> mailto:[EMAIL PROTECTED] >> Fone: +55 61 321-2433 Fax: +55 61 225-3082 >> 15? 45' 04.9" S 47? 49' 58.6" W >> 19? 37' 57.0" S 45? 17' 13.6" W > =============================================================================== Richard B. Langley E-mail: [EMAIL PROTECTED] Geodetic Research Laboratory Web: http://www.unb.ca/GGE/ Dept. of Geodesy and Geomatics Engineering Phone: +1 506 453-5142 University of New Brunswick Fax: +1 506 453-4943 Fredericton, N.B., Canada E3B 5A3 Fredericton? Where's that? See: http://www.city.fredericton.nb.ca/ ===============================================================================
