GD0180 SOUTH CHINA SEA GEOLOGICAL SURVEY CARRY OUT BY M/V “NAN HAI 503” “HAI YANG SHI YOU 708”“HAI YANG SHI YOU 623” IN AREA BOUNDED BY 19-25-14.1N 112-08-43.0E，19-24-24.4N 112-04-53.1E，19-36-28.1N 111-59-50.1E，19-40-15.6N 112-06-03.4E，19-39-58.3N 112-16-46.8E，19-50-06.2N 112-24-02.6E，19-48-32.1N 112-26-28.9E，19-36-21.9N 112-17-45.4E AND 19-35-32.2N 112-04-51.2E FROM 5 SEP TO 5 DEC. SIGNAL LIGHTS AND SHAPES WILL BE EXHIBITED ADVISED TO AVOID GUANGDONG MSA CHINA