What signal indicates a vessel is restricted in its ability to maneuver?

The signal indicating that a vessel is restricted in its ability to maneuver is the display of a "ball, diamond, ball" shape. This specific shape is used as a day signal for vessels that cannot follow the usual navigational rules, typically due to their work or the nature of their operations. It alerts other vessels to the restrictions of maneuverability and warns them to proceed with caution in close proximity to the restricted vessel.

This visual signal is part of the International Regulations for Preventing Collisions at Sea (COLREGs), which standardizes maritime communication to enhance safety on the water. By recognizing this specific shape, other boat operators can understand the limitations faced by the restricted vessel and navigate accordingly, reducing the risk of accidents or misunderstandings in busy marine environments.

Other options, though they represent various sounds or signals used in navigation, do not communicate the specific condition of being restricted in maneuverability.