From their site:BLACK WATER NAVIES.Single ship action in deep space. 810 ships are listed for the 92 nations of the Black Water universe. Each ship can be modified to your taste. The Damage Table enables a vessel to take damage and still fight. All aspects of naval warfare are included. The rules were written by a naval officer with 9 years at sea.Each rule system is designed to allow you to use figures from old games.The Armies is large numbers for 1/285 scale. The info provided is the same type and can be used with the Marines rules. Ideal for those wanting large armor battles. The Marines is the small numbers version. Info in both can be used in either. This is designed for a squad - @10 - of marines and 1 or 2 small tanks. Ideal for those wanting small infantry squad size battles. Designed for 25mm figs, any size can use. 15mm work best when doing boarding actions. Both sets of rules include MUTTS, tanks, hovers, artillery, infantry, mines.Available as in hard copy or as download. - BoardGameGeek