After gaining access to the pirate town of Mos Le'Harmless, players must be carrying this book in their inventory to understand what other pirates are saying. Otherwise, the pirates will respond with a fixed script of incomprehensible pirate slang. Players who have completed Cabin Fever can obtain another copy from bookshelves in their houses. Bill Teach (aboard The Adventurous, docked at Port Phasmatys) will also give them a copy before taking them to Mos Le'Harmless if they do not have one in their bank, inventory or house.