North Korea affects South Korean flights with jamming signals...

The government says North Korea has been emitting electronic jamming signals and disrupting the GPS systems of private South Korean airplanes. The Transport Ministry says the North's attack began Saturday and has affected 252 aircraft, eleven of which are foreign-flagged airliners. The jamming mainly occurred between 6 a.m. and 11 p.m. The ministry says none of the flights were endangered, and the planes have continued to operate as usual. The ministry is also looking out for maritime damage as the jamming could have affected Navy or Coast Guard vessels, cargo ships and fishing boats operating in the Yellow Sea.
(KBS World Radio, 2012-05-02)