While these devices are often easily found on international online marketplaces for a few dollars, the legal risks are severe. What are GPS jammers and how do you combat them? - Geotab

Buying and using a GPS jammer is in many major jurisdictions, including the United States, Canada, Australia, and the UK. These devices are designed to overwhelm satellite signals with radio noise, which can have catastrophic consequences for public safety by interfering with emergency services and aviation. The Legality of Purchasing Jammers