What is GPS jammer? Why use it?

Hi, Douglas
This is an electronic equipment that using the electronic jamming principle. Originally used for military purposes. Mainly used in electronic warfare. Now begin to used in civilian areas
GPS signal jammer can be effectively blocker signal Global Positioning System. Whether you are at home or in the driving process, it can guarantee that your personal location is not available. Your personal privacy can be adequately protected. Such devices are also often used to protect politicians and counter espionage operations.