Which of the following lights must a dredging vessel display?

A dredging vessel is required to display a specific set of lights and shapes that indicate its operations to other vessels on the water. The correct choice highlights that a dredging vessel must exhibit lights and shapes that are specifically designed for dredging operations. These signals are crucial for ensuring that nearby vessels are aware of the dredging activity and can take appropriate action to avoid collisions.

The dredging signals typically include a combination of navigational lights and signal shapes, such as a green over white light or day shapes that indicate the presence of equipment extending from the vessel. This visibility is vital for safety, as dredging can create hazardous conditions for other vessels due to the equipment and the potential for changing water depths in the immediate area.

Other options do not fully encompass the regulatory requirements. While anchor lights or general navigation lights might be part of a vessel’s lighting, they do not provide the specific indications necessary for a dredging operation. Therefore, merely displaying anchor lights or navigation lights that apply to all vessels isn't sufficient for a dredging vessel, as these do not specifically signal the nature of its operational status. Consequently, choosing the answer that emphasizes the specific shapes and lights required for dredging operations closely aligns with the COLREGs regulations designed to promote safe navigation around