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As far as I'm aware, to be all legal and above board, you'd need a permit to scatter the ashes, which they will only grant you for cemetaries and the like. That said, if you were to release the ashes off, say, the deck 7 aft overlook when no one else was around, I'd be surprised if you ran into a problem. Not than I'm encouraging you to be super sneaky about it, but it seems to be one of those things people just do quietly on their own.No permit required. (Who issues permits for International waters anyway?)