What does it mean for a vessel to be not under command?

A vessel that is not under command refers to a situation where it is unable to maneuver as required due to circumstances beyond its control, typically because of mechanical failure or other impairments. This designation is crucial in maritime navigation, as vessels that are not under command have specific rights and responsibilities under the International Regulations for Preventing Collisions at Sea (COLREGs). This status alerts other vessels that the affected vessel cannot take the necessary action to avoid collision, thereby necessitating caution from nearby vessels.

In this context, options such as being in dry dock, undergoing repairs, or participating in a race do not accurately define a vessel's inability to maneuver. A vessel in dry dock is not operational but is not relevant to navigation. A vessel in repairs may be able to maneuver to some extent, depending on the situation, but a vessel not under command is a definitive status indicating complete incapacity to act, which emphasizes the importance of recognizing its limitations at sea. A vessel in a race, while actively on the water, is functioning and maneuverable, hence does not meet the criteria of being not under command.