I really appreciate the link they provided at the end of where to buy one.
These personal sized units are not really a risk to aviation etc as is being said, that is just an argument to make the public turn against the freedom from unwanted surveillance that jammers bring. These work by transmitting noise at the frequencies that the GPS satellites transmit at so the local receiver can't tell where it is, which is the same as when it's in a tunnel or parking garage. The range on these battery operated personal ones is only a few feet, so no naval ships or airplanes thousands of feet or miles away are bothered. The ones that bother fishing boats and such are high powered transmitters designed to block other parties at a distance and have nothing to do with these small ones people use to stop their boss knowing what they are doing with the company delivery truck.
the problem is that the legitimate GPS signal is ridiculously weak, and generally speaking, to reliably jam, you need a significantly stronger signal. (well, and compared to a solar-powered transmitter on a satellite, it's pretty hard not to have a significantly stronger signal) I'm not a RF guy myself, but I hang out with a bunch of them. Guaranteeing that your jammer only had a range of a few feet sounds... difficult.
I personally know people that have had problems with their systems that have been traced back to truckers with GPS jammers.
These personal sized units are not really a risk to aviation etc as is being said, that is just an argument to make the public turn against the freedom from unwanted surveillance that jammers bring. These work by transmitting noise at the frequencies that the GPS satellites transmit at so the local receiver can't tell where it is, which is the same as when it's in a tunnel or parking garage. The range on these battery operated personal ones is only a few feet, so no naval ships or airplanes thousands of feet or miles away are bothered. The ones that bother fishing boats and such are high powered transmitters designed to block other parties at a distance and have nothing to do with these small ones people use to stop their boss knowing what they are doing with the company delivery truck.