My experience with evasives is they nearly all reduce speed considerably in addition to snaking around. I find it best to keep tracking the target. They will usually start to follow a new baseline. Us your map to draw a line through their new baseline and time how long it takes them to go a known distance. They will give you their evasice speed withing a knot or two. A fast task force will usually not snake but just use a new course and speed. Regardless, the speed each will use can vary widely, so it's best to track and time them.
-Pv-
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