What document must be activated when heavy weather is expected?

The heavy weather bill is the correct document to activate when heavy weather is expected because it outlines the specific procedures and actions that must be taken to ensure safety and operational readiness during adverse weather conditions. This document provides guidance on securing the ship, preparing equipment, adjusting watch schedules, and ensuring that crew members are aware of their responsibilities in the event of heavy weather.

When heavy weather is anticipated, activating the heavy weather bill ensures that all crew members are thoroughly briefed on safety protocols and the measures required to minimize the risks associated with rough seas, such as securing loose items, preparing the vessel for rough conditions, and ensuring lifesaving equipment is ready for use. This proactive approach is critical for maintaining the safety of the crew and the vessel during potentially dangerous weather events.

The other documents mentioned, while important for different scenarios, do not specifically address the unique challenges presented by heavy weather conditions. The emergency action plan could cover various emergencies but lacks the specific focus on weather-related protocols. The security bill pertains to security operations rather than weather preparedness, and the maintenance schedule is concerned with routine maintenance tasks rather than immediate actions required for severe weather.