China's space tracking ship Yuanwang-3 set sail on Thursday for the Pacific Ocean from the dock of the China Satellite Maritime Tracking and Controlling Department in east China's Jiangsu Province for its upcoming maritime monitoring missions, the ship's fourth voyage this year. It has successfully undertaken more than 90 maritime tracking and monitoring tasks for spacecraft, including the Shenzhou spaceships, the Chang'e lunar probes and the BeiDou satellites.