HB13/22 BOHAI SEA SUBMARINE WORK FOR MV YATAI1 IN WEST ANCHORAGE OF QINHUANGDAO PORT FROM 0030UTC TO 1130UTC DAILY FROM 14 TO 18 JAN. ENTERING AND ANCHORING PROHIBITED WITHIN 0.3 MILES RADIUS OF 39-50.00N/119-37.19E. CAUTION ADVISED. HEBEI MSA CHINA.