[quote] Originally posted by Elspode
If you are able to receive a WAAS-enabled satellite (or even both of them which are so equipped), you can get accuracy down to 3 meters, which I can get under good conditions. Is that accurate enough?[quote]
I don't know. Is it?
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Real world use, without a lot tree cover, tall buildings or hills around you is 10-20 meters...still pretty damn good. Higher-end units apparently do 'averaging' automatically, and give you a distilled location based on multiple readings. The essential function of GPS *is* triangulation, ..snip
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Let me clarify. If they give you an "exact" location, but you can only come close because of interference, can you take several readings around the target and triangulate the exact location. Or do you have to search a 40 meter or so diameter area for the goodie box? Hope that's a more gooder explanation. 
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