A continuing series of incidents have been reported in the general location of incheon, republic of korea…

Original warning text

YELLOW SEA.
GPS SATELLITE SYSTEM.
DNC 23.
1. A CONTINUING SERIES OF INCIDENTS HAVE BEEN REPORTED
   IN THE GENERAL LOCATION OF INCHEON, REPUBLIC OF KOREA
   AND THE SURROUNDING GYEONGGI AND GANGWON PROVINCES OUT
   TO APPROXIMATELY 100 NAUTICAL MILES BEGINNING ON OR
   ABOUT 310000Z MAR. THE NATURE OF THE EVENTS APPEAR
   TO BE GLOBAL POSITIONING SYSTEM (GPS) JAMMING EMANATING
   FROM THE DEMOCRATIC PEOPLE'S REPUBLIC OF KOREA CAUSING
   SIGNAL DISRUPTIONS TO AIRPLANES, SHIPS AND BUOYS IN THE
   AREA. EXERCISE CAUTION WHEN TRANSITING THIS AREA.
   IF APPROPRIATE, FURTHER INFORMATION MAY BE FORTHCOMING.
   VESSELS EXPERIENCING DISRUPTIONS IN THE AREA ARE URGED
   TO REPORT THEM TO THE POINT OF CONTACTS:
   CIVILIAN-NAVCEN, PHONE: 703 313 5900,
   HTTP://WWW.NAVCEN.USCG.GOV
   MILITARY-GPS OPERATIONS CENTER AT
   HTTPS://GPS.AFSPC.AF.MIL/GPSOC,
   DSN 560 2541, PHONE: 719 567 2541,
   E-MAIL: [email protected],
   HTTPS://GPS.AFSPC.AF.MIL
   MILITARY ALTERNATE-JOINT SPACE OPERATIONS CENTER,
   DSN 276 3514, PHONE: 805 606 3514,
   E-MAIL: [email protected].
2. CANCEL HYDROPAC 1377/12.