Thanks to +Carlo Bottiglieri and +Richard G for the links to their work on nautical battles. I have completed my research and started my actual work. Besides their work I looked at: Pirates of the Sea of Fallen Stars Spelljammer OD&D BECMI Expert Set Pathfinder: Skull and Shackles AD&D 1st ed DMG I feel like I will wind up taking at least something from most of them. I want to use hex maps and I want wind direction and momentum to really matter. I have also decided that I don't want to use a hit point-type system, instead I will rely on a critical hit chart and sinking/breaking up rules. There still will be a bit of hit point-type activity when it comes to breaking up, but I want it to have a different feel than man-to-man combat. You can watch my progress over the next week or so here .