BOHAI SEA ，TUG “SHENG LI 291” TOWING “SHENG LI ZUO YE SI HAO” PLATFORM FROM CACB20B（38°12′45.15″N， 118°51′21.92″E）TO CACB25B（38°14′21.35″N， 118°49′06.34″E）. FROM 121600 UTC Apr. TO 181600 UTC Apr. SPEED 4 KNOTS. LENGTH OF TOWING 300 METERS. CAUTION REQUESTED.