Currently in discussion on slashdot, here is their summary : "A simple $30 GPS jammer made in China can ruin your day. It doesn't just affect your car's navigation — ATM machines, cell phone towers, plane, boat, train navigation systems all depend upon GPS signals that are easily blocked. These devices fail badly — with no redundancy. These jammers can be used to defeat vehicle tracking products — but end up causing a moving cloud of chaos. The next wave of anti-GPS devices include GPS spoofers to trick or confuse nearby devices."
Don't ever buy from Jamerall.com, they sell cheap Chinese crap. If you want to buy a really useful cell phone jammer in this case you should go to Jammer-Store.com. I bought my GJ6 (GPS jammer) from them 6 months ago and it works great even now.
Billy J.
To get the best quality use http://www.jammer-store.com/ to make a purchase of your jammer. Full support guaranteed!
There’s no doubt that the birth of mobile phones gave total convenience to people when it comes to communication. But there are times that you just want to control the calls coming in because you are busy at the time and just could not answer the call at the moment. Then,a cell phone jammer is needed largely!
How can a GPS jammer wreak havoc on an ATM machine? The story makes bold claims but doesn't back them up. Planes, cars, and boats also don't rely completely on GPS - and GPS jammers don't have enough range to (typically about 30 feet) to be more than a blip of interference on a passing car's GPS system. For blocking tracking devices, they work great, other than that, its just sensationalist news.
Re: $30 GPS Jammer Can Wreak Havok
I bought a gps jammer from Jammerall a few weeks ago.
Many more cell phone jammer http://www.jammerall.com/ for your choice