o ships with locator capabilities are searching a 240km (150 mile) path in a bid to retrieve the data recorder.
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MH370 - Facts at a glance
8 March: Malaysia Airlines Kuala Lumpur-Beijing flight carrying 239 people disappears
Plane's transponder, which communicates with ground radar, was switched off as it left Malaysian airspace
Satellite 'pings' indicate plane was still flying seven hours after satellite contact was lost
24 March: Based on new calculations, Malaysian PM says "beyond reasonable doubt" that plane crashed in southern Indian Ocean with no survivors
What we know
The search for flight MH370
Australian naval vessel Ocean Shield is using a towed pinger locator device from the US Navy, while HMS Echo, which had similar capabilities, was also searching.
They are trying to detect an underwater signal emitted by the data recorders.
But on Friday Australia's search chief Angus Houston said it was a race against time as the battery-powered signal fades after 30 days.
Ships sighted a number of objects in the area on Friday but none were associated with the missing plane, the coordination agency said.
ACM Houston said that the area had been picked on the basis of analysis of the satellite data.