Fernando, Good to hear that you decided to ignore Ruby! Oxygen thief!
I have a rather old (i.e. 5 years!) Garmin GPS45 which I have used all over Australia, Argentina, Chile and Antarctica. Out of curiosity I have checked the clock against the time beerps on our national radio. Spot on to the second. Of course, in modern terms, only nano seconds seems to be acceptable, but for sundial work, my Garmin would not cause any noticeable errors. There is a couple of web GPS pages, and I am sure that you could find out more there. Unfortunately I can't give you the URLs at the moment, they are on my notebook, that I managed to kill. BTW, these GPS web sites also have information on the Y2K problem and GPSs. Seems that most of the "good" brands have no problem. If anyone is interested in these URLs, post a message and I will see if I can recover them from my notebook. Cheers from cloudy Sydney John Dr John Pickard Senior Lecturer, Environmental Planning Graduate School of the Environment Macquarie University, NSW 2109 Australia Phone + 61 2 9850 7981 (work) + 61 2 9482 8647 (home) Fax + 61 2 9850 7972 (work)