In the Ball Watch section of the 2009 WW Annual, it says the EMII Diver GMT movement is an official COSC chronometer. I don't recall anything about that in Ball literature or on the website. I have found mine to be about -2 seconds per day, but I'm sure I would have remembered if it was COSC certified. I assume its a misprint. Sooooo many misprints that I've come across in the 09 Annual.