Why do you say that? Maybe someone will ask that way. Because such GPS jammer have a camouflage appearance, can be disguised as daily necessities, in the interference process is not found. For some places that need to remain quiet, such as conference rooms, churches, classrooms, cinemas and other places are essential items. Because the interference source is difficult to be found, so it is a relatively safe way of interference.
A jammer for a specific service like GPS can simply be a low power transmitter on the frequency range used by the GPS satellites. Even if it transmits enough signal to overwhelm your GPS receiver for a few feet, anyone standing near you could carry one in a pocket.
There are many types of drone jammer, hand-held, desktop and suitcase type and so on. In addition to these ordinary appearance of the jammer, there are some very high hidden jammer. For those who have special needs, such jammers are undoubtedly the best choice.
When GPS jammer operated, they can substantially degrade or disrupt critical military and civilian applications by blocking radiocommunications signals used for the radio-navigation-satellite service. Some people believe the devices can be useful and people should have the right to buy them. For example, Michael Kharkovoy, CEO of Jammer-Store, told Fox News that GPS jammers can be stowed easily in a car or a bag and can help avoid spy detection — say, from a spouse who suspects infidelity and plants a GPS tracking device like the Zoombak in a car.
North Korea’s GPS jamming is not an event isolated in time or geography. Jamming over wide areas is happening all the time in the Middle-East and Ukraine. GPS jammers are in regular use by organized crime for theft of high value cargo, and terrorist have been captured with jamming devices. And they are used by otherwise law-abiding individuals who don’t wish to be followed. One sampling showed 25% to 30% of trucks in an industrial area having jammers in operation! This “citizen jamming” has resulted in disrupted aircraft landing systems, idled container terminals, and countless dropped cell phone calls.