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http://www.foxnews.com/story/0,2933,538323,00.html?loomia_ow=t0:s0:a16:g2:r2:c0.338870:b27024840:z0
Pennington said cellular service is spotty and global positioning satellite directions can be unreliable on unmaintained roads and open desert in and around Death Valley.
"A GPS does not replace a map, a compass, checking in at the visitor center and letting people know where you're going to be," Pennington said.