This document outlines the certificates and documents that must be carried onboard ships according to the IMO's MSC Circular 1151. It lists the mandatory certificates for all ships, passenger ships, cargo ships, ships carrying dangerous goods, and nuclear powered ships. It also lists some optional certificates for special types of vessels. The certificates certify that the ship complies with safety, pollution prevention, and security conventions. They include classification certificates, load line certificates, safety management certificates, and certificates for specific cargoes. Maintaining the proper documentation is necessary for ships to safely operate internationally.