On Sunday, speaking from the tarmac at RAAF Pearce base, Flt Lt Russell Adams gave an update regarding the Australia-led search for the missing MH370.

Mr Adams said that after an 11-hour mission aboard a military aircraft, the team was able to spot four orange objects, measuring more than two metres.

"We were able to detect many objects in the water today. We were able to rule a few out as fishing buoys and fishing nets, however, of interest today we did encounter an area within approximately five nautical miles which included at least four orange coloured objects greater than approximately two metres in size each," Mr Adams told the press.

Mr Adams said that the orange objects were yet to be scrutinised by the Australian co-ordination centre.

"It's for the rescue co ordination centre to analyse these and send investigators to investigate as they see appropriate, however, for my crew, from our perspective this was the best visibility we had of any objects in the water and gave us the most promising leads," he said.

Mr Adams said that the Orion was well-equipped for the duration of the search. He said that it was able to stay for an extra hour of searching.

"We really wanted to investigate those objects to give ourselves the best chance of identifying them before we came home," Mr Adams said.

Meanwhile, the Australian Defence Vessel Ocean Shield (ADV) sailed to support search operations in the Southern Indian Ocean on Sunday.

The ADV was fixed with United Sates Navy (USN) with a Towed Pinger Locator (TPL-25) and a Bluefin-21 Autonomous Underwater Vehicle (AUV). These equipment are to be employed to detect audio Pingers from MH370's blackbox.

Commodore Peter Leavy said that the TPL-25 will be greatly utilise as soon as decision to narrow the search area is made.

"The search area remains vast and this equipment can only be effectively employed when there is a high probability that the final location of Flight MH370 is better known. I am also conscious that the efforts of the international community in attempting to find evidence of MH370 will help bring answers to those who lost loved ones onboard," Mr Leavy said in a statement.

Mr Leavy said that with the ADV, the search will be able to continue search even with bad weather conditions.

"The Navy's task will be complicated by the prevailing weather conditions in the region. However, they will sail knowing that our ship, equipment and personnel are the best available for this mission. Likewise the USN equipment is the best for the job at hand, and the specialist operators, ADF members and ship's crew are all highly trained and prepared."