Why is the Procedures and Arrangements Manual important for certain vessels?

The Procedures and Arrangements Manual is crucial for vessels because it lays out specific protocols and frameworks for managing substances that may present environmental or safety risks, such as Noxious Liquid Substances. This manual ensures that the vessel adheres to regulations established by maritime authorities, which are designed to protect both the crew and the marine environment from the harmful effects of these substances.

By having clear procedures and arrangements in place, the vessel can effectively manage the handling, storage, and disposal of noxious substances, which is fundamental for compliance with international regulations like MARPOL (International Convention for the Prevention of Pollution from Ships). This includes detailed instructions on how to operate systems for containing and managing spills or leaks, which is vital in preventing pollution during the vessel's operations.

The other options, while they may represent operational aspects of vessel management, do not directly relate to the core purpose of the Procedures and Arrangements Manual as it pertains to environmental safety standards and regulations.