Ah...I get it now. Duh.
The inherent accuracy of the GPS is more than sufficient to get you into rather close visual proximity of the object. Then, you have to find the likeliest place for it to be hidden. More often than not, there are the aforementioned "pirates treasure" type clues included. Sometimes these are encrypted so you can try to find it first without the extra info, then decrypt the message (the key is given on the same page if you with to print it out and take it with you) and hopefully have all the clues you need.
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"To those of you who are wearing ties, I think my dad would appreciate it if you took them off." - Robert Moog
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