YELLOW SEAM/V “ARCHIMIDIS” TRIAL VOYAGE FROM 080600UTC TO 101200UTC APR 20 IN AREA BOUNDED BY THE LINES JOINING. A:37°25′N,123°34′E; B:36°50′N,123°34′E; C:37°25′N,123°44′E; D:36°50′N,123°44′E, CAUTION ADVISED. SHANDONG MSA CHINA