Quote:
Originally Posted by formula154
As far as the GPS is concerned, doesn't a GPS just tell you the distance point B is from point A? Example if you rode on a round track with a diameter of 1 mile which was 3.14 miles around the track wouldn't the GPS say that you traveled 1 mile from point A even though you actually rode 3.14 miles because you stopped 1 mile from the starting point? It doesn't measure miles of elevation either does it?
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That depends on the quality of the GPS unit and the number of points it established going from point A to point B. If it established 100 way points going from one place to the other the distance it came up with could be very close. If it only took 2 or 3 points along the way that accuracy drops. Civilian GPS units, good as they are, are for crap when compared to that of a surveyor whose unit will measure within a very few centimeters. Altitude is the one that is most often inaccurate as it is ellipsoidal.