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How does DARPA calculate the error of an entry?

April 26, 2017CALCULATE darpa Error

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How does DARPA calculate the error of an entry?

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DARPA will use a spherical model for the Earth to compute the distance between the exact location and the entered location. The Haversine formula (http://en.wikipedia.org/wiki/Haversine_formula) will be used with an assumed Earth radius of 3959.0 miles.