What document requires verification of all locks and locking devices prior to getting underway?

The Master Light-Off Checklist (MLOC) is crucial for ensuring safety and operational readiness before a vessel gets underway. This checklist includes a series of verifications and procedures designed to confirm that all essential systems, including locks and locking devices, are functioning properly. By verifying these components, the MLOC helps to prevent safety hazards that could arise from malfunctioning locks or unsecured areas on the vessel. This thorough inspection process is integral to maintaining operational safety and ensuring that the vessel is fully prepared for its journey.

While the Safety Management Plan and the Operational Procedures Manual may include general safety guidelines and operational protocols, they do not specifically focus on the meticulous verification of locking mechanisms like the MLOC does. Meanwhile, a Lock and Key Inventory offers a record of locking devices but does not serve as a procedural checklist to certify that these devices are in working order before departure. Thus, the Master Light-Off Checklist is the definitive document that ensures all necessary checks, including those pertaining to locks, are completed satisfactorily before getting underway.