GD0077 SOUTH CHINA SEA UNDER WATER ENGINEERING WORK BY M/V “HAI YANG SHI YOU 291”“HAI YANG SHI YOU 289” “SHEN QIAN HAO” “HAI YANG SHI YOU 287” “ZHONG JIAO HAI GONG 001” “HAI YANG SHI YOU 683”“DE HAI” IN AREA WITHIN 2N MILE RADIUS OF 20-31-02.9N 113-51-54.1E FROM 14 APR. TO 30 SEP. SIGNAL LIGHTS AND SHAPES WILL BE EXHIBITED ADVISED TO AVOID GUANGDONG MSA CHINA