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I used Google Earth to map a 24 mile route here in the bay area. I used the "path" feature and zoomed in close enough so I could put over 1000 dots in the individual lane of the highway I use. This way when I went around a corner I made the distances between my points only a few feet. (Remember "piece-wise linear" in math class?) Anyway I'm in the same boat Google Earth is showing 1-2 percent longer then ODO and SG. If I get a GPS that would be four different measurements for the same route.
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