NORTH YELLOW SEA, FROM 200600UTC TO 261500UTC APR， DONGYI601 TRIAL VOYAGE IN THE AREA BOUNDED BY:
A：38-30N,121-50E；
B：38-16N,121-50E；
C：38-16N,122-00E；
D：38-30N,122-00E.
CAUTION TO AVOID.
SHANDONG MSA CHINA.