They all gain experience each patrol; I think it's a set amount (5 points per patrol? Don't recall right now). Promotions you have to give them. If you click on the icon of a crewman, details will show up in the screen in the bottom right hand corner. The bar at the bottom is the experience progress bar. When it's full, you can give them a promotion. Each class of seaman has a maximum rank, so each can get at most two promotions.
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We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do anything with nothing.
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