If you go with 100%, I use 3 ways. If I have little time, I just guess based on the recog manual's top speed and how fast they appear to be going. If I have more time, I'll plot them on the map over a set period of time and then do the he covered x distance in y time, solve for speed thing. If I have lots of time, I'll shadow the target and adjust my speed to his until I can hold the range to him steady and then you'll know his speed.
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