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GPS Speeds vs Speedo
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[quote][i]Originally posted by Ian[/i] Speed is the difference in your position between the two points at which you sampled your position. So yes, your altitude does matter, but it is calculated in three dimensions and is factored in. If you drove 100m forward on flat surface in 10 seconds you would have travelled 10m/s If you drove 100m according to an aerial view of the car but down a 1 in 4 hill you've in fact described the hypotenuse of a right-angled triangle with 100m as one side and 25m as the other, which is just over 103m, ie. in the same 10 seconds you've travelled further ie. gone faster. Obviously you also have a change in lateral coordinates unless you're either heading dead north or dead west (an even then earth curvature usually means you still do) and these are always in ther calculation even if they don't contribute much to the triangle. Knots come from the fact that the NMEA sentences contain them and you convert to the user preference in software. [/quote]
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