GD200/21 SOUTH CHINA SEA GEOLOGICAL SURVEY WORK BY M/V “HAI YANG DI ZHI SHI BA HAO” IN AREA BOUNDED BY 21-21-00N 116-33-47E，21-21-00N 116-36-48E，21-13-00N 116-33-48E AND 21-13-00N 116-36-48E FROM 2 TO 30 SEP. SIGNAL LIGHTS AND SHAPES WILL BE EXHIBITED ADVISED TO AVOID GUANGDONG MSA CHINA