Phoenix Stonex S900 - Page 45

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The Carlson XPort tool automatically downloads grid files from the internet as needed. Thus it is important to have                  
internet access when building GEOID files in an area for the first time.
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7.3 Building a GSF file for a project:
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1. Start the Carlson XPort tool using the desktop icon
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2. From the main menu of the X-port tool, select Tools > Geoid Manager
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3. Choose the correct Geoid. If you are in the United States, the current correct GEOID is ‘USA (Geoid 12B)’, however                   
other geoids are available for use if you need to match an older job.
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4. Enter the center of job in Dd.MmSsss; select an appropriate size (Ex: 200 miles)
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5. Click “OK”, the tool may need to go online to download the base geoid files, then choose an appropriate location for                    
the output file. I prefer to use the Geoid name, followed by the State, followed by the general area. Save as “.grd”                     
extension.