Datum Transformations: NAD27 Shift to NAD83
Maps & Cartography

Geodetic Datums: NAD 27, NAD 83 and WGS84

Ellipsoids, survey benchmarks and triangulation – these are the ingredients for geodetic datums. NAD27, NAD83 and WGS84 are common datums in North America.

Geodetic Survey Benchmark
Maps & Cartography

Survey Benchmark Monument Locations

If you’re serious about geocaching, than you’ve probably heard of benchmark hunting. A survey benchmark is a disk in the ground with a latitude & longitude.