Roger Clarke, geospatial information manager with the 99th Civil Engineer Squadron, demonstrates logging a man-made landmark, in this case an electrical manhole, into the mobile Geo XT global positioning system Oct. 30, Nellis AFB, Nev. After logging the point into the handheld unit, Mr. Clarke will return to his office and upload the information into the Nellis GeoBase program, where the information will be readily available for all GeoBase users. (U.S. Air Force photo by Airman 1st Class Ryan Whitney)
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