HB0010 BOHAI SEA SUBMARINE WORK FOR MV JABAL NAFUSA IN WEST ANCHORAGE OF QINHUANGDAO PORT FROM 270100UTC TO 271100UTC JAN. ENTERING AND ANCHORING PROHIBITED WITHIN 0.4 MILES RADIUS OF 39-50.82N/119-38.25E. PASS WITH SLOW SPEED. CAUTION ADVISED. HEBEI MSA CHINA.