What is the purpose of the stability book for a vessel?

The stability book for a vessel serves a crucial role in ensuring the safe navigation and operation of the ship by providing essential stability information. This information includes data on the vessel's center of gravity, buoyancy, metacentric height, and stability criteria under various loading conditions. Having this information readily accessible is vital for the Chief Mate and other officers when making decisions related to loading, ballast, and trim adjustments to maintain adequate stability throughout the vessel's operational lifecycle.

In practical terms, a well-maintained stability book supports compliance with safety regulations and provides the necessary calculations to prevent capsizing or excessive heel due to cargo shifts or weather conditions. This focus on safety and operational integrity is paramount for the vessel’s performance and crew's wellbeing.