GD221/21 SOUTH CHINA SEA SEISMIC SURVEY BY M/V “HAI YANG SHI YOU 721” IN AREA BOUNDED BY 21-00-59N 115-42-02E，21-33-48N 115-41-46E，21-34-05N 116-36-49E AND 21-00-57N 116-36-56E FROM 1 OCT. TO 31 DEC. THE VESSEL TOWING 10 CABLES LENGTH 6000M WITH ORANGE VISUAL BUOY AT EACH CABLE END FLASHING WHITE LIGHT AT NIGHT SPEED 4.5KN SIGNAL LIGHTS AND SHAPES WILL BE EXHIBITED CROSSING THE CABLES AREA PROHIBITED GUANGDONG MSA CHINA