Using triangulation, GPS can deliver the location to the receiver within centimeters of its exact spot.

　　It is important to note that GPS radio mobile signal jammer use a specific frequency. There are actually two major frequencies that GPS work on: one is for public, non-military use (1575.42 MHz) and one that is used solely for the US military (1227.6 MHz). Because GPS is nothing more than radio waves, these waves can be jammed, though technical devices and expertise are needed for that purpose.

　　While GPS jammers have been created (specifically by the government, military organizations and spy or privacy gadget companies), most civilians do not have the technical capabilities to create their own home made device. It is much more difficult than just blocking a radio signal with basic radio interference.

　　Most GPS Jammers are built for military uses, for instance, to confuse the enemy on where their exact location is or where the enemies GPS guided missiles or bombs will fall. However, there are a few civilian uses for jamming GPS signals including the ability to conceal oneself or one’s vehicle in the case that it is being tracked by a GPS receiver.

　　It should be noted that most GPS jammers are illegal to build or use in many countries or localities due to the potential for misuse. For instance, a GPS jammer can confuse aircraft and other vehicle instruments, possibly causing mishaps. Some GPS jammers state that they are only for civilian GPS jammers only; however some military equipment, must first sign onto the civilian GPS radio frequency in order to gain access to the military GPS frequency.