(PDF) GPS interference in the Korean peninsula

From the FAA Notice: "U.S. OPERATORS FLYING IN THE INCHEON FIR (RKRR), ESPECIALLY NEAR SEOUL, SOUTH KOREA, ARE ADVISED THAT THEY MAY EXPERIENCE INTERFERENCE WITH OR DISRUPTION OF THEIR GPS NAVIGATION SYSTEMS WHILE FLYING IN THIS AREA. THERE HAVE BEEN REPORTS OF CIVIL AIRCRAFT EXPERIENCING GPS NAVIGATION SYSTEMS INTERFERENCE. IN THE EVENT INTERFERENCE OR DISRUPTION IS ENCOUNTERED, PILOTS SHOULD BE PREPARED TO USE NON-GPS NAVIGATIONAL AIDS. " (www.faa.gov) עוד...