Who is in charge of the overall ship security during their watch?

The Officer of the Deck (OOD) is responsible for the overall ship security during their watch. This crucial position involves overseeing and ensuring the safety and security of the entire vessel, including its crew, operations, and assets. The OOD acts as the representative of the Commanding Officer when they are absent and has the authority to make decisions regarding security protocols and responses to potential threats.

In addition to enforcing and monitoring the ship's security measures, the OOD maintains communication with other watchstanders and departments to ensure a coordinated response to any incidents that may arise. This role is pivotal in managing the ship's security posture while the OOD is on watch, making it clear that this individual holds ultimate responsibility during that time.