Pilots' Almanac is a maritime source book for HârnWorld setting. It has articles on different kinds of ships sailing in the seas of Kethira, how to pilot the ships and what kind of crews they have, on maritime trade and the profession of shipwrights. Also included are rules for building ships and crews, trading and piloting, three maps (Hârn, Trierzon and Shorkyne), index of ports and a maritime glossary.