This book investigates the fundamental principles of seaworthiness in sailing vessels, focusing on the complex interplay between hull design, stability, and the forces of nature. Marchaj, a naval architect and experienced sailor, draws upon extensive research, including historical case studies and advanced hydrodynamic principles, to present a comprehensive analysis of what makes a boat safe and capable at sea. The work aims to provide a deeper understanding of the physical phenomena governing a vessel's behavior in waves and wind, moving beyond empirical rules to a more scientific basis for design and evaluation.

This book is regarded as a seminal work in naval architecture and yacht design, particularly for its rigorous scientific approach to seaworthiness. It is frequently cited by designers, naval architects, and serious offshore sailors for its depth of analysis and practical insights. The work is considered essential reading for anyone seeking to understand the complex factors that contribute to a vessel's safety and performance in challenging marine environments.