Seven months after the Boeing jet disappeared with 239 people onboard, the Australian Transport Safety Bureau, leading the hunt for the jet, said ongoing analysis had helped refine the zone where an underwater search began this week.
"The latest analyses indicates that the underwater search should be prioritised further south within the wide search area for the next phase of the search," it said.
Despite an extensive hunt for the plane, which was en route from Kuala Lumpur to Beijing when it mysteriously turned southwards on March 8, no sign of it has been found.
Aviation experts had little to go on besides the satellite communications from the plane, information they have used to pinpoint a search area in the vast ocean off western Australia.
They believe the best hope of finding the plane is within the seventh arc, or the final satellite "handshake" from the plane, estimated to be when it was in descent.
The ATSB said Wednesday that when all elements of the analysis so far were taken into account, it indicated that the aircraft "may be located within relatively close proximity to the arc", although further south than initially thought.