A GPS jammer is a small, self-contained signal blocking device used to block GPS tracking by sending a radio signal at the same or farther range as the GPS device.
The relatively low power and quick start-up time allow the jammers to be used only when required. Although illegal, various types of cheap GPS jammers are available for purchase online, such as physical shields, Wi-Fi/Bluetooth jammers, remote control jammers, spy camera jammers, and drone jammers, just to name a few.
How a GPS jammer works?
- The user plugs the jammer into the automotive auxiliary power outlet.
- The unit is placed close to the installed GPS tracker.
- When active, the GPS jammer generates an interference signal over a 5 to 10 meter radius to disrupt reception of the GPS satellite signal.
A GPS tracker receives microwave signals from an array of satellite transmitters orbiting the Earth. Once the tracker receives signals from four or more satellites, it determines its position through a series of time calculations and trilateration. The receiver relies on these precise and specific satellite signals to determine where it is in the world. The GPS tracking device then transmits this position and velocity information to a monitoring location, usually, sent over the cellular network.
In some cases, satellite malfunction or solar flares can temporarily disrupt the transmission of GPS signals. A GPS jammer is different though in that it sends out radio signals or signal noise with the same frequency as the GPS device, to override or distort the GPS satellite signals. When this occurs, the GPS device can then no longer calculate its position because the satellite signal is masked by the interference.
Who uses GPS jammers?
The reasons for using jammers are varied. Originally created by the government, GPS jammers were designed for military use. Concealing vehicle location can be crucial to the success of a mission. The devices act as a cloak giving the military privacy, increased safety and an overall advantage in high-risk situations.
Owners who buy old cars, or users of some private activities also have needs.
Are GPS jammers legal?
GPS jamming is illegal in many countries, such as the U.S., Canada, and also in the UK. In the U.S., the federal Communications Act of 1934 outlawed the marketing, sale or use of GPS jammers. In Canada, the Radiocommunication Act also prohibits importing, manufacturing, distribution, selling, possessing and using GPS jamming devices.
But if you have special needs, some buyers can still get the opportunity to authorize it. This is only for authorized users.
Summarize
Regardless, GPS jammers are an effective means of preventing tracking. Especially when many illegally installed GPS trackers are not easy to find, this kind of device is very effective.
For some special GPS trackers, we may also need to use a cell phone signal blocker that blocks 2G 3G signals. Only such a blocker can completely block GPS tracking.