HB185/21 BOHAI SEA FROM 0000UTC TO 0800UTC DAILY FROM 10 TO 12 DEC SEA TRIALS BY SHIP HONGJIHAIGONG17 IN AREA BOUNDED BY THE LINES JOINING：
（1）39-53.80N/119-35.80E；
（2）39-53.80N/119-34.50E；
（3）39-52.80N/119-34.50E；
（4）39-52.80N/119-35.80E.
CAUTION ADVISED. HEBEI MSA CHINA.