China's largest patrol and rescue ship Haixun 01 officially joined the Shanghai maritime authority on Tuesday morning, and authorities said it will strengthen the country's ability to perform emergency rescues and monitor ocean pollution.

"It will mainly cover inspection and rescue duties in the East China Sea but is also on call nationally for emergencies," said Zhai Jiugang, deputy director of the maritime safety administration.

Haixun 01 is equipped with a helipad to allow airborne searches and rescue missions. "The vessel, which can also be regarded as a helicopter carrier, makes it possible to expand the cruising range for search and rescue," Zhai said, adding that it's the country's fourth patrol ship with a helipad.