Originally Posted By wandering_daisy
I would think horizontal distance. Based on several satallites the GPS should be capable of measuring the distance on the slope, but I am not sure all GPS units are that sophisticated. If it gave you slope distance than that would not match the map that is shown on your GPS screen.


But if it does not give you the slope distance, it will not match the distance you hike. With a GPS in a car, the distance traveled matches the odometer with a correction for the percent the odometer is off.

I think I'm going to have to go climb a mountain and see. Yet, as you say, if it does it that way, it will not match the map.


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