GPS jamming - North Korea is notorious - Curt Lewis

Aviation agency to warn North Korea on GPS jamming

Jamming operations by North targeted at aircraft navigation systems in South

The International Civil Aviation Organization decided earlier this month to send a formal warning to North Korea regarding the country's GPS jamming activity, South Korea's Yonhap News Agency reported Thursday.

The ICAO, the United Nations' aviation regulatory agency, decided at its 208th board meeting - held in Montreal, Canada, from May 16 through June 17 - to send a letter to Pyongyang warning against further active use of GPS jamming equipment causing disruptions in South Korea.

The Global Positioning System (GPS) is a space-based worldwide navigation system which relies upon a constellation of orbiting satellites built, launched, and maintained by the United States military. The technology is openly available to anyone with a GPS receiver unit.