The vessel found eight ships in the nearby waters and has contacted two Malaysian ships among the eight. They said they found nothing related to the plane.
An international search and rescue mission from Malaysia, China, Singapore, Vietnam, the Philippines, Thailand and the United States was mobilised with the sea mission.
Search operations continued overnight and air mission resumed at daybreak Sunday.
The plane took off from Kuala Lumpur at 12.41 a.m. Saturday and was due to land in Beijing at 6.30 a.m. the same day.
The 227 passengers on the flight included five Indians, 154 Chinese and 38 Malaysians.