What must the OOD do upon verifying a loss of gyroscope?

Upon verifying a loss of gyroscope, the Officer of the Deck (OOD) must shift steering to Full Follow-Up. This action is essential because a gyroscope is critical for providing stabilization and maintaining the vessel's heading. When the gyroscope is lost, the steering system may no longer effectively maintain the intended course. By switching to Full Follow-Up, the OOD ensures that the steering control directly reflects the inputs provided by the helm, allowing for more precise maneuvering.

This is particularly important in maintaining control of the vessel during challenging conditions where navigation could be impacted by the loss of gyroscopic stabilization. Full Follow-Up allows for immediate and responsive steering adjustments, which is crucial for both safety and compliance with navigational protocols.

Other options may seem relevant, but they do not directly address the immediate need for maintaining control over the vessel after a gyroscope loss. For instance, stopping the vessel immediately or reducing speed could be relevant in certain situations but may not provide the necessary control and maneuverability needed to handle the situation effectively. Notifying emergency services might be appropriate in some cases, but it should not be the first action taken in response to a gyroscope failure, as immediate adjustments to the steering system are critical.