I have geology data in a local mine grid. When I import the XYZ data into Surfer the coordinate system shows as "Unreferenced Local System". I get that part. In Surfer (version 12) I can arbitrarily change the coordinate system to say UTM NAD83 Zone 12N, and again I get that part. What I don't understand is how Surfer can convert from the unreferenced local system to UTM NAD83, or some other pre-defined projection. I would have thought you would have to provide Surfer with some parameters about the local system, or is this a detail I don't have to worry about ?
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