YOU’D THINK CONFIRMING that the piece of airplane that washed ashore on Réunion came from Flight MH370would be great news. If nothing else, it proves investigators have been spending their time and money looking in more or less the right place. And it provides a pretty good idea of where they ought to be hunting for more clues, so they can puzzle out where and why the Boeing 777 went down, right?

Not exactly.

On Wednesday, the Australian Transportation Safety Bureau (ATSB), which is leading the hunt for MH370, published an updated map (above) showing its latest, best guess of where it expects to find debris from the Malaysia Airlines jet, which disappeared March 8, 2014. After reviewing calculations based on the new evidence, the bureau says it is “satisfied” that finding wreckage on Réunion “is consistent with the current underwater search area in the southern Indian Ocean.”