A fourth ship with specialized underwater equipment will join the search for a Malaysia Airlines jet 10 months after it vanished off Australia's west coast.

Acting Australian Prime Minister Warren Truss says the ship Fugro Supporter is on its way to the search area after conducting trials off the Indonesian island of Bali.

Truss, filling in while Prime Minister Tony Abbott is on personal leave, said Monday the ship is equipped with an autonomous underwater vehicle that will be used to scan portions of the search area that cannot be searched effectively by the equipment on other vessels.

Not a single trace of Malaysia Airlines Flight 370 has been found since the Boeing 777 vanished with 239 people aboard last March 8 en route from Kuala Lumpur to Beijing.