On July 11, 2005 (Lunar Calendar, June 6, 2005) China's "Sea Day" was officially launched.July 11, 2005 is the 600th anniversary of the world-famous Chinese great navigator Zheng Shui, the state decided to designate July 11 each year as "Sea Day".The theme of the first "Sea Day" is "love the motherland, good neighborhood friendship, scientific navigation."