GPS jammers were originally created by governments for military organizations and spy agencies. Uses include confusing an enemy's exact location, or dropping an enemy's GPS-guided missiles or bombs.
More recently, civilians have sought out these gps blocker device to ensure their privacy in an increasingly GPS tracking world. However, most civilians lack the technical ability to make their own homemade devices, as it is a bit more complicated than just blocking radio signals with basic radio jamming. 

Jamming GPS signals has a few civilian uses, mostly privacy-related, including the ability to hide yourself or your vehicle from being tracked by GPS receivers. A practical application would be a salesperson or delivery driver who might want to have lunch outside of their territory, or come home to pick up a forgotten item without much explanation due to GPS tracking on the vehicle. The range of most civilian GPS jammers is sufficient to cover the largest vehicles, giving users a coat of privacy.

What does a GPS jammer look like?

Because GPS-blocking devices come from multiple manufacturers, they vary widely in shape, size, and size, making them difficult to spot in a driver's car. Most commonly, GPS blockers work over short distances and are small enough to plug into a power source like a cigarette lighter or iPhone and block the signal from GPS trackers installed in the cockpit of a vehicle.

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