A vessel constrained by draft must display how many all-around red lights at night?

A vessel constrained by draft is required to display three all-around red lights at night to indicate its status. This signaling is important because it helps other vessels recognize that the vessel is restricted in its ability to maneuver due to its draft. The configuration of three all-around red lights, arranged vertically, serves as a clear visual warning to nearby ships, alerting them to exercise caution when navigating near the constrained vessel.

This regulation is part of the International Regulations for Preventing Collisions at Sea (COLREGs), which aim to promote safe navigation. By following these conventions, mariners can effectively communicate the operational limitations of vessels constrained by draft, enhancing safety on the waterways during nighttime operations.