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You can import a GeoTIFF in UTM units and convert the coordinates of the map to display Lat/Long. To do this:

1. Go to Map | New | Base Map
2. Select the GeoTIFF file and click Open. The base map is created and the coordinates are referenced according to the image referencing.
3. Select Base in the Object Manager and go to the Coordinate System tab in the Property Manager. If the referencing also included coordinate system information, it is automatically entered here.
4. If not, click the Set button, select the original source UTM coordinate system appropriate for the image, and click OK.
5. Select Map in the Object Manager and go to the Coordinate System tab in the Property Manager.
6. Click the Change button.
7. Select the appropriate Lat/Long coordinate system you want (usually Predefined | Geographic (lat/lon) | World Geodetic System 1984) and click OK. Now the image base map is converted to Lat/Long for display in the plot window.

You can also convert the projection of an image in our Didger software. Import the image into Didger, use View | Change Projection to change the projection to Unprojected Lat/Long, and export to a new GeoTIFF. This new GeoTIFF can be used directly in Surfer to create a base map in Lat/Long.