Has anyone else considered making shoals a little more interesting? Based on the theory that a ships draft is proportional to it's burden I was thinking of assigning shoals drafts (or depths) when they are placed. Ships of with burden less than or equal to the depth may move over shoals freely. Ships with greater burdens will run aground as per the rules. For a more uncertain varaint, you can draw a B chit when a ship contacts a shoal; use the value of the chip as the depth value.