BEIJING, Oct. 15 (Xinhuanet) -- Four ships tracking China's Shenzhou-6 spacecraft have fought down rough sea situations and functioned well as of Saturday.

    The four "Yuanwang" series ships that encountered bad weather from posts in the Pacific, Indian and Atlantic oceans late Friday have readjusted their positions on the sea that ensured the fulfillment of their tasks of tracking, measuring and remote controlling of China's second manned spacecraft, said Jian Shilong, an official in charge of the monitoring of the manned space flight.

    The tracking ships have accomplished designed tasks Saturday despite the unfavorable weather on the sea, contributing to the smooth flight of the manned Shenzhou-6 that blasted off Wednesday and has circled the Earth for 55 times on the fourth day of its trip in orbit.

    The ships and some 20 surveying stations on land jointly build up China's space telemetry network that monitors the orbiting Shenzhou-6.

    The four ships, all were involved in China's past five Shenzhou flights during 1999-2003, boast advanced technologies in terms of the functions and precision of measuring and controlling, automatization and reliability. Enditem