YELLOW SEAM/V XIN SHENG SHENG 7 TRIAL VOYAGE FROM 270000UTC TO 280900UTC APR. IN AREA BOUNDED BY THE LINES JOINING. 37-35N 123-15E; 37-35N 123-25E; 37-20N 123-25E; 37-20N 123-15E。 CAUTION ADVISED. SHANDONG MSA CHINA