GPS finds major use in most equipment and systems to provide location information instantly both in civilian and military applications. 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 devices. 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. 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.

The availability of UAVs or drones with GPS capability also provides the capability for terrorists to have surveillance of potential target sites for reconnaissance. Jammers constitute an enemy force, and as the Chinese General Sun Tzu stated in the Art of War more than 2,000 years ago, battles will be won by knowing your enemy. Because GPS is nothing more than radio waves, these waves can be jammed, though technical devices and expertise are needed for that purpose. For instance, mobile signal jammer can confuse aircraft and other vehicle instruments, possibly causing mishaps.

The type of GPS jammer is Area Protection System against Satellite Navigated Hostile Threats which is a system designed to protect specific locations against missiles guided by GPS. Nevertheless, a certain number of jammers are in the hands of individuals around the world and they continue to be available from manufacturers and suppliers in certain countries. This information will also help in developing countermeasures that could be incorporated into GPS receivers to limit the impact of wifi jammer. It is much more difficult than just blocking a radio signal with basic radio interference.

Can provide cover for military signals from 10km to 150km and for civilian signals it varies between 30km to 350km. A team of researchers from Cornell University and the University of Texas at Austin reports on their analyses of the signal properties of 18 commercially available GPS jammers. In 2009, outages of a Federal Aviation Administration reference receiver at Newark Liberty International Airport close to the New Jersey Turnpike were traced to a $33, 200 milliwatt GPS jammer in a truck that passed the airport each day. 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.

Using triangulation, GPS can deliver the location to the receiver within centimeters of its exact spot. The use of GPS Systems helps terrorists to navigate on land in mountains, jungles or desert terrain thereby providing them with a high degree of mobility and action capability. These devices use the signal received from a minimum of three GPS navigational satellites or more to calculate the location information. Some GPS jammers state that they are only for civilian GPS jamming only; however, some military equipment must first sign onto the civilian GPS radio frequency in order to gain access to the military GPS frequency.

So, GPS jamming is a continuing threat both at home and abroad and a detailed understanding of how the available signal jammer work is necessary to judge their effectiveness and limitations. There is extensive use of GPS in military equipment and systems both on man-pack and vehicular basis enabling forces to move accurately during operations both during day and night. This provides them the capability to cause the death of both civilians and security forces as well as the destruction of property and infrastructure giving them high visibility for their cause.

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