What does a white light indicate on a moored vessel?

The indication of a white light on a moored vessel is associated with a vessel that is anchored. In maritime navigation, specific lights are designated for various types of vessel operations and statuses. A white light, specifically displayed from the mast of a vessel, signals to other vessels that the anchored vessel is at rest and not underway. This helps other mariners recognize that the vessel is not navigating and is safely secured in a stationary position, which is essential for maintaining safe distances among vessels in close proximity.

In contrast, the other options, such as a vessel under command or a vessel not under command, would typically use different light configurations to convey their operational status. For example, a vessel not under command would display two red lights, while a vessel under command would have a different light setup as well. Each of these light signals serves to ensure clear communication regarding a vessel's status to enhance safety on the water.