YELLOW SEAM/V CHENG RUI 8 TRIAL VOYAGE FROM 262300UTC TO 291100UTC MAY. 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