In reply to Liwen Ouyang.

Liwen, thanks for the comment. Without a systematic way to combine the information from the previous two years of search, it might've taken much longer than 1 week to locate AF447. Had they started from day one with a Bayesian strategy, it's possible to locate the wreck sooner. Notice how the high density area surrounding the last known location didn't change that much from prior to posterior, which means they would've focused on this area much sooner had authorities been pointed to this region after say the first two rounds of Bayesian updates.