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Old 12-13-2015, 01:26 PM   #104 (permalink)
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Join Date: Jan 2015
Location: Atlanta area
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Just a thought on using gps devices to measure speed and distance. I have noticed that when going uphill or downhill, the gps speed decreases a little compared to the speedo in my truck. I am guessing that this is because the gps device only sees horizontal movement and not vertical movement.
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