You
can choose lat/long as either your source or target coordinate system in the Surfer worksheet. To do that, choose Geographic (lat/lon) in the Assign Projection dialog and select the appropriate datum. Exact instructions are:
1. In the Surfer worksheet, go to Data | New Projected Coordinates.
2. In the New Projected Coordinates dialog, click the (...) button next to either Source Coordinate System or Target Coordinate System (whichever you want to specify at lat/long).
3. In the Assign Projection dialog, open the Predefined | Geographic (lat/long) category.
4. Under
this category is listed many different datums. You can choose which datum your
lat/long coordinates use. Most simple lat/long coordinates use World Geodetic
System 1984 (WGS84) as the datum. Select the datum you wish.
5. Click OK and the lat/long coordinate system is entered, in this case as the Source Coordinate System.
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