YELLOW SEA MILITARY ACTIVITY IN AREA BOUNDED BY THE LINES JOINING: (1) 35-36.50N/120-04.00E; (2) 35-36.50N/120-17.60E; (3) 35-24.50N/120-17.60E; (4) 35-24.50N/119-57.00E. FROM 150000UTC TO 151000UTC APR、FROM 162200UTC TO 170500UTC APR, ENTERING PROHIBITED. CANCEL SD0091.