Originally Posted By: Desperado
Later I ran into some surveyors using calibrated GPS equipment (the back pack style from trimble).

300m off with the GPS units surveyors use? Wow, that's HUUUUUGE. I remember reading some specs on a Leica surveyors GPS unit. It said something like it is capable of accuracy to within 6 millimeters!!!

If anyone can give us an alternate satellite navigation system to GPS, it's...Google! smile