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Re: GPS calibration?
surveying companys get centimeter accuracy with $40,000 GPS units (my company has 4 of them). typically hand held units are only accurage within 3 -5 meters. i doubt you will ever get "balls on accurate" with a hand held unless it's using WAAS, and even then it only gets just under 3 meter accurate. i'm pretty sure the built in GPS on the phones are not WAAS capable, however.
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