NORTH YELLOW SEA, FROM 250000UTC TO 251000UTC MAY， H488 TRIAL VOYAGE IN THE AREA BOUNDED BY:
A：38-00N/121-40E；
B：38-00N/122-00E；
C：37-48N/122-00E；
D：37-53N/121-40E.
FROM 251000UTC TO 301600UTC MAY， H488 TRIAL VOYAGE IN THE AREA BOUNDED BY:
E：38-28N/121-42E；
F：38-28N/122-25E；
H：38-08N/122-25E；
G：38-18N/121-42E.
CAUTION TO AVOID.
SHANDONG MSA CHINA.