Set Up Datum: WGS84
Working Location Grid Zone: 19S (North/Center of Chile)
The GPS achieved UTM coordinates are very consistent with Google Earth maps, no more than 5 meters of difference.
Next, I set up my device for PSAD 56 datum (Chilean government official datum). I take note of this new coordinates in PSAD56 datum (same place), then I convert to WGS84 using CoordTrans software and I get more than 200 meters of error (+180 mt N, +65 mt E) respect Google Earth maps.
Any comment or advise?