A U.S. military reconnaissance aircraft made an emergency landing during annual South Korea-U.S. military exercises in March when North Korea jammed its GPS device, it emerged Thursday.
According to a report the Defense Ministry submitted to Democratic Party lawmaker Ahn Kyu-baek of the National Assembly's Defense Committee, the RC-7B took off from its base at 8:30 p.m. on March 4 but had to make an emergency landing about 45 minutes later due to disruption of its GPS functions by jamming signals transmitted from Haeju and Kaesong in North Korea at intervals of five to 10 minutes that afternoon.
The jamming signals also disrupted the GPS devices of coastal patrol boats and speed boats of the South Korean Navy. Several civilian aircraft in the Gimpo area were also affected.
The North deploys vehicle-mounted jammers that can disrupt signals within 50-100 km and is reportedly developing a jamming device capable of disrupting signals more than 100 km away.