What documents must a watchstander ensure are present aboard?

The presence of the vessel's registration, safety management certificate, and crew list is essential for a watchstander, as these documents ensure compliance with legal and safety regulations.

The vessel's registration certifies that the boat is officially recognized and allows the watchstander to verify that the vessel is operating legally. The safety management certificate indicates adherence to safety protocols, which is critical for ensuring operational safety and minimizing risks during maritime operations. Finally, the crew list is necessary for maintaining awareness of who is onboard, which is vital for accountability and safety in case of emergencies. Together, these documents form a comprehensive basis for both legal compliance and operational safety, which are key responsibilities of a watchstander.

The other options include documents that, while important in different contexts, do not directly align with the fundamental requirements for operational safety and legal status that a watchstander must verify before undertaking their duties.