SD418/25,BOHAI STRAIT, FROM 300700 UTC JUN TO  071500 UTC JUL,WECO SENNA TRIAL VOYAGE  IN AREA  1 BOUNDED BY THE LINES JOINING 38-00.00N 120-26.83E,38-00.00N 120-28.80E,37-57.43N 120-29.50E, 37-54.00N 120-29.50E, 37-54.23N 120-27.80E,37-56.67N 120-24.33E AND AREA 2 BOUNDED BY THE LINES JOINING  38-30.00N 121-50.00E,38-30.00N 121-55.00E,38-16.00N 121-55.00E, 38-16.00N 121-50.00E.CAUTION TO AVOID. SHANDONG MSA CHINA.