Who is responsible for investigating the cause of an alarm on board a vessel?

The responsibility for investigating the cause of an alarm on board a vessel typically falls to the watch officer on the bridge. This is because the watch officer is tasked with the safety and monitoring of the vessel's operations, including any alarms that may indicate potential issues or emergencies. They are trained to assess situations, determine the nature of alarms, and take appropriate action based on the vessel's procedures and safety protocols.

The watch officer has the authority and expertise to make critical decisions in response to alarms, which can include notifying other crew members, initiating emergency protocols, or communicating with the engine room staff to gather information. Their role is central to ensuring the vessel's safety and operational integrity, making them the logical choice for this responsibility.

While the engine room staff and deckhands are important members of the crew and may assist in an investigation, the primary duty to address alarms and manage their implications lies with the watch officer. The ship owner, while ultimately responsible for the overall safety and operation of the vessel, does not directly engage in the day-to-day monitoring and response required by alarms.