It's not anything to do with precision of WGS84, but of cumulative
error of the various systems. No measured point with anything but a
DGPS will be closer tan 12 feet, so you start out with a 3 meter
error, most likely a lot more. Then there are errors in the maps
themselves, translating it into a projection and all the other
possible hardware and software errors that add up.

If you're within 20 feet, feel lucky.

-John Coryat

http://maps.huge.info

http://www.usnaviguide.com
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