GD0251 SOUTH CHINA SEA DRILLING OPERATION BY DRILLING PLATFORM “NAN HAI SI HAO” IN AREA WITHIN 1N MILE RADIUS OF 20-31.61N 109-25.85E FROM DECEMBER 12, 2020 TO JANUARY 22，2021 SIGNAL LIGHTS AND SHAPES WILL BE EXHIBITED WIDE BERTH REQUESTED GUANGDONG MSA CHINA