What does "Restricted in Ability to Maneuver" (RAM) refer to?

"Restricted in Ability to Maneuver" (RAM) refers to a vessel that is unable to keep out of the way of other vessels due to the nature of its work. This designation is often applied to vessels engaged in specific activities that limit their ability to change direction or speed, such as conducting underwater operations, laying cables, or performing maintenance tasks. The RAM status signifies to other vessels that they should exercise caution and be aware of the limitations of the affected vessel's maneuverability.

The other options do not fit the definition of RAM. A vessel at anchor is generally able to provide some navigation signals but has restricted movement simply due to being anchored. A vessel that is aground is stuck on the bottom and cannot maneuver at all; however, it doesn't fall under the specific category of being "restricted." Likewise, a vessel tied to a dock is secured and not navigating, which also does not denote a restriction in ability due to its work activities.