BOHAI SEA ，TUG “SHENG LI 291”TOWING “SHENG LI ZUO YE XIN SI ” PLATFORM FROM CB 25F（38°14′10″N， 118°49′35″E） TO CB 20B（38°12′45.15″N， 118°51′21.92″E）. FROM 181600UTC MAR. TO 231600 UTC MAR. SPEED 4 KNOTS. LENGTH OF TOWING 300 METERS. CAUTION REQUESTED.