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For those without a satnav lock yet: Datum is a defined 3D geometry model used to translate a physical coordinate given by satnav into a latitude, longitude and altitude.

Different datum -> different lat/long/alt.

Disclaimer: Trimble alum

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you're the perfect person to ask about this: i have a trimble i used to survey some points (using RTX) that shows a ~1 meter offset from data i've collected using piksi PPK'ed against a CORS station. i've checked the datum i export in on the trimble (wgs84) and the datum of the CORS base station and despite performing a conversion i can't get them to line up. any ideas?

Are they the using the same realization of the datum? https://vdatum.noaa.gov/docs/datums.html

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