GD140/21 SOUTH CHINA SEA M/V“MENG NA GONG ZHU”CARRY OUT EQUIPMENT TESTING IN AREA BOUNDED BY 20-58-41N 117-55-59E，20-58-41N 117-56-49E，20-59-31N 117-56-49E AND 20-59-31N 117-55-59E FROM 5 TO 20 JUL. DAY AND NIGHT SIGNAL LIGHTS AND SHAPES WILL BE EXHIBITED WIDE BERTH REQUESTED GUANGDONG MSA CHINA