Datum Issues when Converting between GPS data and NAD27

Downloading GPS data stored in WGS84/NAD83 datum and displaying them with GIS data in NAD27 datum can result in a 100's of meters in error! Here is a guide through the Datum tarpit. What follows is an Alaska approach. Parks in Conternimus US (lower 48) can utilize substitute CONUS instead of NADCON ALASKA under step-by-steps. ................
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