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GPS coordinates on maps

Measurers - when you put GPS coordinates on maps, please indicate the datum of your coordinates. NAD 27 and NAD 83 can be anywhere from 4 feet to 150 feet different locations for the same coordinates, depending on where you are. WGS 84 is also a different location than NAD 27 or NAD 83.

If they don't have the correct datum set on their GPS device, the coordinates are unlikely to do any good.
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