BOHAI SEA ， TUG“HAIYANGSHIYOU641”“BINHAI285” TOWING “HAIYANGSHIYOU921” PLATFORM FROM BZ26-6-1（N：38°17′15.192″ E：119°19′21.000″） TO KL17-1-2(N：37°39′00.423″ E：119°49′38.560″） FROM 290400 UTC APR .TO 061600 UTC MAY.SPEED 4 KNOTS.LENGTH OF TOWING 507 METERS. CAUTION REQUESTED.