I've been listening to the Audible version of Unbroken, and one of the points underscored by it was how hard it was to find something on the ocean when you're looking for it and its occupants are actively trying to attract your attention.
They were saying on CNN that biologists can track it by the barnacles that are on it much like plants and insects. If this is true than it should get them really close.
I'm up to the part where he's in the "unarmed combatant" camp near Yokohama. It's amazing what they did with what little they had...
