It have a GPS tracking devise in my car how accurate are they any way around it on 2008 Chevrolet Silverado 2500 HD

I was told a magnet by GPS could do something .is there anything I can do to it so I still seen on GPS screen

by in West Babylon, NY on August 27, 2013
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1 answer
ANSWER by , August 28, 2013
PLEASE BE MORE SPECIFIC