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...error propagation on bumps and wind, GPS hysteresis, hill cross check, Euler method step size...
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I thought it would be as easy as going to
H. B. Van Duzer Forest State Scenic Corridor* about 4 am, with a jury-rigged light plane pitot tube.
*long straight downhill 2-lane with 80' fir trees growing right up to both sides of the road.