CompuServe Messages

Hi I did read your posts, and I think I'm getting most of your "points"<g>, especially this bit about the earth not being round (but not flat, either, I hasten to add!). Anyway, this still does not explain what appears to be wierdness in the original statement. It seems to me that the two points that are actually being used for any GPS measurement is some theoretical point in the sky determined by sattelites, and a particular, and singular, point on the ground. As you point out, and I'm sure you are completely correct, the accuracty of that point depends on various stuff that I'd rather let you explain than to reiterate. But when you are comparing two points on the eath, each independantly and separately measured by the GPS technique, the relative accuracy of those two points shouldn't be dependant in any way on the distance between them. I think. Cheers, GTL Greg Laden Dept. of Anthropology Harvard University Cambridge MA 02138