An explanation from Inmarsat how they concluded the flight ended in the Indian Ocean off Australia:http://www.telegraph.co.uk/technolog...own-MH370.html

I note this passage negates the data passed back to Rolls Royce:
..one of Inmarsat’s satellites continued to pick up a series of automated hourly 'pings' from a terminal on the plane, which would normally be used to synchronise timing information.