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Haijian 66 (Chinese: 海监66) is a China Marine Surveillance (CMS) ship in the East China Sea Fleet . She is one of the fastest CMS ships in the second building plan. In February 2012, Haijian 66 obstructed Japanese survey vessel Syoyo (HL-01) in disputed waters near Okinawa.
CMS ships of the same class, 1,000t-class Type-II, include Haijian 75.