I'd think map plotting would be easier. Take a range and bearing of the target, start clock and mark it on the map. Wait a minute and repeat. Use the ruler to measure the distance travelled. Now you have time and distance, calculating speed is easy after that...granted it requires we have bearing info as a map plotting tool. I have yet to play the game so thats something im not sure we have. But if it is, its accurate under all conditions.
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