The accuracy can range quite a bit depending on the number of sats you are locked on and how tightly you are locked. But the high end commercial units that are used for surveying and construction services are accurate to a fraction of an inch. Unfortunately it will be some time before that accuracy comes to a level that it can be used in handheld or dash mounted units. My Rhino 530 is in the range of 10-30 feet depending on the factors above and how close you zoom in on your position on the screen, the closer you zoom the more accurate your location.
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