From publisher blurb:

Adventures on the High Seas has something for everyone: Magic and monsters, pirates and jungles, exotic ports and ship combat rules, and lots and lots of people and places for adventure.

26 ships of the world statted out, plus ship-to-ship combat rules.
12 character classes, including the Pirate, Sailor, Bard, Minstrel, Prestidigitator, Juggler, Shaman, and other O.C.C.s.
24 character sheets.
The Gladiator O.C.C. and the arena.
The Necromancer O.C.C. and Necro-Magic.
17 additional skills, and characters with multiple O.C.C.s.
The seas and islands of the Palladium World, described.
10 cities/towns/locations mapped and described, plus ruins and wilderness.
Many islands described: The Kingdom of Bizantium, Isle of the Cyclops, Floenry Island chain, Gryphon Island, and many others.
Many Random Encounter Tables, adventure settings, and adventure ideas.
Many notable NPCs, cults, pirates, dangers, magic items and more.