ERAS is the best mod for COAS. It has many characters where most of them are real historical figures. It has the most ship options. You can bury treasure if you find a spade and caching chest. Can repel boarders, choose a personal flag from over 100 options. Sound reverb option. HUD scaling option. Some items increase chance that if you are sunk at sea, you can sometimes survive, wash ashore and just resume play.