GD195/21 SOUTH CHINA SEA SURVEY AND DRILLING OPERATION BY M/V “HUI TONG 68”“SHUN HANG 168”“HUA HAI 258” IN AREA BOUNDED BY 21-08-36N 111-59-56E，21-12-50N 111-59-56E，21-10-10N 111-49-52E AND 21-05-59N 111-49-53E FROM 27 AUG. TO 31 DEC. SIGNAL LIGHTS AND SHAPES WILL BE EXHIBITED ADVISED TO AVOID GUANGDONG MSA CHINA