What is the definition of “vessel not under command”?

A "vessel not under command" refers specifically to a situation where a vessel is unable to maneuver due to exceptional circumstances. This might include conditions such as equipment failure or other emergencies that prevent the vessel from following the navigation rules or responding to the actions of other vessels.

This definition is crucial in maritime navigation rules because it indicates that the vessel cannot take actions that are ordinarily expected under the rules, which impacts how other vessels must respond to ensure safety on the water. Recognizing a vessel not under command is important for giving it the right of way and understanding the limitations it faces in navigating through crowded waterways or near other vessels. In contrast, a vessel being anchored or involved in a collision does not fit the criteria of being "not under command." Additionally, failing to maintain a proper lookout pertains to a vessel’s watchkeeping duties rather than its operational status related to command.