There will always be something that goes against any idea ever concocted by man. In fact, upon the widespread increase of use of GPS by the civilians, there have been many inventions that may counter the GPS effects. These inventions are now commercially available also. Funny, it would seem that the ones, who is intended to be found by the gps tracking device, are also the ones who do not want to be found. But as this might sometimes be the case, countermeasures, like the GPS, are again available commercially in both stores and Internet.