What does "not under command" imply?

When a vessel is described as "not under command," it means that the crew is unable to control the vessel. This condition can arise from various circumstances, such as mechanical failures, loss of steering, or other significant issues that render the vessel incapable of maneuvering as required by the navigation rules. This designation is critical for other vessels to understand the situation, allowing for more cautious navigation in the vicinity to avoid collisions or accidents.

The essence of this terminology highlights the urgency and seriousness of the incapacity, as vessels that are not under command are required to display specific lights and shapes to signal to others that they cannot respond to navigational commands. This communication is essential for maintaining safety at sea.

While other contexts, such as crew incapacitation or mechanical issues, might contribute to a vessel being classified as "not under command," the key factor is the inability to control the vessel itself. Similarly, waiting for orders would not apply here, as a vessel awaiting orders does not imply a loss of control but rather a temporary halting of navigation.