Originally Posted by
Wogster
It's useless unless your trying to compute the %grade on a hill, think about it this way, you really don't care if point A and point B are 400m apart, if your 40m higher up you want the running distance, 401.996m because that is how far the wheels have turned.
A <.5% error when you're going up a 10% hill is hardly useless. For all practical purposes the horizontal distance works just fine.