GD135/21 SOUTH CHINA SEA SEISMIC SURVEY BY M/V “HAI YANG SHI YOU 721” IN AREA BOUNDED BY 20-56-48N 114-12-12E，20-20-36N 113-59-12E，20-11-36N 114-33-54E，20-20-06N 114-37-12E，20-17-06N 114-48-06E AND 20-46-54N 114-57-54E FROM 29 JUN. TO 15 OCT. 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