Quote Originally Posted by azfiddle View Post
I love my Garmin 305. I've had it a little over a year. I never have problems in the Tucson area, but while we were vacationing in N. California and the Pacific northwest, it sometimes gave me really screwy readings for the % grades.
GPS doesn't do elevation figures with any degree of accuracy...at all. For that one would need an altimeter. I think Suunto has a GPS/altimeter combo, but for a LOT more dough (like 3-4x the price of the 305).