BRAD HORN/Nevada Appeal Sterling Hamilton, 18, from left, Jack Martinez, 17, Joe Thompson, 17, and Andrew Lau, far right, listen to Karl Yonkers, with yellow Global Positioning System unit, demonstrate GPS operations in front of Carson High School on Thursday. Yonkers, of Carson City, is a cartographer for the Nevada Department of Transportation.

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Geographic Information Systems Day is about location, location, location

• By ncs-import
• November 17, 2004