BOHAI SEA ，TUG “SHENGLI291” “SHENGLI242” TOWING “SHENGLIZUOYEXINYI” PLATFORM FROM CB251A (N：38°14′10″/E：118°51′09″) TO ZH104 (N：38°07′33″/E：118°57′15″) FROM 151600 UTC MAY .TO 221600 UTC MAY.SPEED 3 KNOTS.LENGTH OF TOWING 300 METERS. CAUTION REQUESTED.