trim and stability book

A trim and stability book is a detailed guide used by ship operators and marine engineers to ensure a vessel remains balanced and steady at sea. It includes calculations and procedures for adjusting the ship's weight distribution—such as cargo, ballast, and fuel—to prevent excessive tilting (trim) or rolling. The book helps maintain safe and efficient conditions, ensuring the ship stays stable during various operations and sea states. It’s a vital reference for planning loading and ballasting, ensuring the vessel’s safety, comfort, and optimal performance throughout a voyage.