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As long as you have DGPS, the accuracy is centimeters ... most handheld GPS don't have that capability ... I had to modify mine with a DGPS antenna when I was first learning about them. Basically you have close enough to hurt someone using only the satellites ... adding the D, gives you coordinate correction based on a physical location on earth. This gets you close enough to vaporize your target. I was involved in marking locations at a shipping port so we could keep track of the location of each container. Took a while to get the data, but very much improved the location checkers job.
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