Which officer on the bridge supervises the helmsman?

The role of the Helm Safety Officer is specifically focused on ensuring the safety and proper navigation of the vessel while it is operated by the helmsman. This officer is responsible for supervising the helmsman directly during maneuvering, ensuring that the commands are executed properly and safely.

While the other roles, such as the Junior Officer of the Deck (JOOD) and Quartermaster of the Watch (QMOW), have important responsibilities related to the overall operation of the vessel, they do not specifically focus on supervising the helmsman and ensuring that helm operations are carried out with the highest safety protocols. The Commanding Officer (CO) has a broader scope of responsibility, overseeing the entire operation of the ship, but does not directly supervise the helmsman during maneuvers.

Thus, the Helm Safety Officer is the designated position specifically aimed at monitoring and guiding the helmsman, making it the most accurate answer in the context of bridge operations.