BOHAI SEA, TUG HAIYANGSHIYOU679 TOWING DRILLING PLATFORM ZHONGYOUHAI 18, FROM 37-55.5N 119-35.9E TO 38-17.6N 119-07.3E, FROM 110700UTC TO 161600UTC OCT, LENGTH OVERALL 543 METERS, SPEED 4 KNOTS VIA 37-55.5N 119-25.0E,38-13.5N 119-25.0E,38-20.5N 119-16.5E.CAUTION TO AVOID.