Ships and Underwater Combat
I have only modified this slightly. I don't know why I didn't post this sooner, but this has helped tremendously with one of my campaigns, as they boarded a Keelboat to go from Orland to Farland. There wasn't any real naval battle, but they were close a couple times.
https://docs.google.com/document/d/1...it?usp=sharing
https://docs.google.com/document/d/1...it?usp=sharing