A RAAF aircraft arrived at the area just before 2pm (AEDT) and three more military aircraft, including two from the United States and New Zealand, are expected to reach the area later on Thursday.
An Australian Hercules will drop marker buoys in the area highlighted by the satellite imagery.
The marker buoys provided information about water movement to assist drift modelling.
"They will provide an ongoing reference point if the task of relocating the objects becomes protracted," AMSA said.
Weather conditions in the area are moderate but visibility is poor.
A merchant ship that responded to a shipping broadcast issued by Rescue Coordination Australia on Monday is expected to arrive in the area about 6pm (AEDT).
John Young, emergency response division general manager at AMSA, said the focus was to continue the search with all available ships and aircraft.
"The objects are relatively indistinct on the imagery," he said.
"The are objects of a reasonable size and probably awash with water."
Mr Young said the ocean in the area was thousands of metres deep.
The news of the discovery was announced by Prime Minister Tony Abbott during parliament.
Mr Abbott said "new and credible information" had come to light in the search for MH370.
"The Australian Maritime Safety Authority has received information based on satellite information of objects possibly related to the search," he said before question time.
"Following specialist analysis of this satellite imagery, two possible objects related to the search have been identified."
The prime minister said an Australian airforce Orion had been diverted to locate the objects and is expected to arrive in the area shortly.
"Three more aircraft will follow," he said. "They are tasked for (a) more intensive follow up search."
Mr Abbott said he has informed Malaysian Prime Minister Najib Razak of the developments.