PERTH - Three acoustic signals detected since Friday have been the best leads to emerge since MH370 disappeared.
Joint Agency Coordination Centre (JACC) head retired Air Chief Marshal Angus Houston described the detection as important and encouraging.
"We are working in a very big ocean and within a very large search area and so far, since the aircraft went missing, we have had very few leads to narrow the search area," he said.
A fleeting signal was detected by Chinese vessel Haixun 01 on Friday and in the same vicinity again for another 90 seconds on Saturday.
"It was just a quick acoustic detection and Haixun 01 stayed in the area, investigating the site. There was another acoustic detection and that was less than 2km away," he said.
The fact that there were two acoustic events at that location provided some promise, Houston said.
A third signal was detected by Australian Defence Vessel Ocean Shield in another location in the southern search corridor yesterday.
Houston said they were still waiting for more information from Ocean Shield.