Ridecamp: RE: [RC] [RC] GPS Distance Accuracy with Hills (long)

April,

The 40 odd miles of trail I have to ride locally (lots of up and down
gullies, around a reservoir) have been "GPS'd" and also measured on foot,
with a wheel. Even on a 15 mile trail, it measures less on GPS compared to
the wheel.

Now, what I don't know is how accurate those wheels are or what the
variances are within the GPS technology. Our trails have lots and lots of
"wiggles" and switchbacks that I wonder whether they are captured by the GPS
technology.

Anyone?

Deanna



-------------------------------------
Hi, Ridecampers,

After it was brought up that my GPS probably wasn't accurate in the
hills, I tended to agree.....
I loaded up my track from Sunday's 26.4 mile ride with Tanna.....
Linear distance: 26.4 miles
Terrain distance: 26.4 miles

What?!? There must be something wrong with the program, I was sure of
it. So I moved over to the Grand Canyon. There are some longer, steeper
trails there. The differences in terrain distance vs linear distance was
also minimal there, but more pronounced than my ride on Sunday. I moved
back to more familiar territory. Pigeon Mountain, GA, where I did my
first LD ride many moons ago. Grades of 8-13. Minimal differences. Like
only hundredths of a mile.



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