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Re: [RC] calculating mileage - Dawn Carrie

When laying out new trail, I first measure it with my GPS.? I ride it at a slow trot, and walk the twisty turny sections to get a better measurement.? I've measured the same?trails with GPS and an odometer on a 4-wheeler, so I know the approximate % correction I need to add to the GPS measurement to get a good mileage figure.? When I get a close approximation to the mileage I'm looking for?with the GPS, I then measure it with a 4-wheeler to double check.? It's always been very close, close enough to have used the corrected GPS measurement, but I'm anal and want to be sure I have the right mileage.? <G>
Dawn Carrie, CT region

On Tue, Mar 10, 2009 at 9:45 AM, Lynn White <lynndeepoo@xxxxxxxxx> wrote:

I have this handy little mechanical wheel meter that I bought from a Soviet Army surplus catalogue for $15. ?I run the thing over a loop on topographic map three times, take the average, and multiply by a factor depending on the relief on the map. ?Lots of relief gets a 15% increase, rolling hills, 10%, and flat, 5%. ?I can calculate these mileages off my kitchen table while the weather is bad. ?I’ve checked ?some of these loops with an odometer on site and my error is about 0.1 mile per 10 miles or ?1%. ?Funny thing was when I got the ride feedback riders were complaining that the loops seemed WAY too long for the mileage given. ?I just had to laugh at that one.


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[RC] calculating mileage, Lynn White