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Old 04-28-2013, 11:53 AM   #9 (permalink)
Argo
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Join Date: Feb 2010
Location: Vail, CO
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If you look at someone going straight down, like a skydiver, and your above him it appears like they are moving really slow with exception to whatever forward momentum they are carrying. If you look at him from the side he is hauling ass. Gps can't differentiate from the angles that you are approaching the earth so the speed it will see is based on how fast of a forward motion you have. If your going 100mph down a 45 degree slope it would track around 50mph unless something is adjusting for the slope/angle of approach.
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