So if we can believe the information, the last ping was either somewhere within a certain arc on the southern water, or over central Asia (meaning land, obviously).
It was the last electronic ping, meaning the plane was definitely not below water at that time. That info was announced last Saturday (at that time, ALREADY A FUCKING WEEK since the disappearance). So why the search is only now being moved in response to that, two fucking weeks since this thing happened, I can't imagine.