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" In its latest provocation, North Korea is jamming signals from the Global Positioning System. The disruptions are affecting air and naval traffic near the demilitarized zone that separates North and South Korea, and are yet another provocation from the unpredictable regime of Kim Jong-un. South Korean government officials report that the jamming operation, which began in late March, has been targeting aircraft navigation equipment. North Korea has reportedly broadcast a jamming signal on 100 occasions. A total of 962 planes have been affected by the jamming, as well as nearly 700 fishing vessels. The jamming has also affected cell phone base stations.  This is the fourth round of GPS jamming by North Korea since 2010. Previous attacks have affected approximately 1,000 civil aircraft and unmanned aerial vehicles of the South Korean military. An attack in 2012 reportedly affected GPS-based car navigation systems in the capital city of Seoul.\u00A0 South Korean officials stress that the attacks haven&amp;#039;t lead to any serious GPS disruptions, as aircraft can also use the older Inertial Navigation System (INS). INS doesn&amp;#039;t rely on outside signals and is jam-proof. North Korea developed its GPS jamming capability in response to GPS-guided weapons that could\u00A0be used by South Korean and U.S. forces in the event of war. The country maintains a regiment-sized GPS jamming unit near the capital of Pyongyang and battalion-sized units near the demilitarized zone. Jamming in 2012 was traced to the town of Kaesong, just over the border.\u00A0 North Korea reportedly purchased truck-mounted GPS jammers from Russia with a range of thirty to sixty miles, and in 2011 was reportedly at work on even longer-range jammers. Sixty miles is more than enough to jam the greater Seoul metropolitan area, home to half of South Korea&amp;#039;s population.\u00A0 South Korean civil aviation is particularly vulnerable to jamming because Incheon International Airport\u2014which serves the greater Seoul metropolitan area\u2014is close to the border with North Korea. Incheon is only 23 miles\u00A0from the demilitarized zone. 49.2 million passengers passed through Incheon in 2015, making it one of the busiest airports in the world.\u00A0 The jamming is taking place even as the head of U.S. Cyber Command, Admiral Michael S. Rogers,\u00A0warns\u00A0that the country is bolstering its cyberwarfare capabilities capabilities it may well have shown off during the\u00A0major cyberattack on Sony Pictures Entertainment, largely suspected to be a state-sponsored attack following the release of the film The Interview.\u00A0 "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/military/weapons/a20289/north-korea-jamming-gps-signals/>