Sokka just listens to Jack and continues to stare at the boat with some grand amount of awe. "It'd have to be, yeah; otherwise, it wouldn't make sense for them. Besides, I don't know how much more there is to civilisation on this continent." Granted, the Water Tribe did well for themselves at the Poles of his world, but he knows just how hard a life that is... and they had magic!

"It's way too large to be a fishing vessel; there's just way too much boat for something like that," he continues. "Could be military, of course, but I don't imagine too many people would want to conquer a place like this. So... trading vessel?"