1. Click Home | New Map | Base | Base.
2. Select the GeoTIFF file and click Open. The base map is created and the coordinates are referenced according to the image referencing saved internally in the TIF.
3. Select Base in the Contents window and click the Coordinate System tab in the Properties window. If the referencing also included coordinate system information, it is automatically entered here.
4. If there is no coordinate system information entered here, click the Set button, navigate to Predefined | Projected Systems | UTM then select the appropriate datum or region and the appropriate zone. Click OK.
5. Select Map in the Contents window and click the Coordinate System tab in the Properties window.
6. Click the Change button.
7. Select the appropriate Lat/Long coordinate system you want (usually Predefined | Geographic (lat/lon) | <your preferred datum>) and click OK. Now the image base map is converted to lat/long for display in the plot window.
8. If you want a new GeoTIFF referenced in lat/long, turn off the axes by unchecking them in the Contents window and then click File | Export and export to a TIF file, saving the spatial reference information internally.

Updated November 2021