United States Coast Guard Captains License Practice Exam

A vessel constrained by her draft is required to display a specific shape to signal her navigational status to other vessels. The correct shape for such a vessel is a black cone, apex downward. This signaling is crucial because it communicates to other mariners that the vessel has limitations on her ability to maneuver due to her draft.

The use of a black cone with the apex facing downward is a standardized visual marker in accordance with the COLREGs (International Regulations for Preventing Collisions at Sea). When other vessels observe this marking, they understand that the vessel is less able to navigate shallow waters and may not be able to change course easily.

The other options do not represent the correct signaling for a draft-constrained vessel. For example, a black cone with the apex upward or two vertical black balls do not denote a vessel constrained by draft, and while a cylinder could indicate a vessel in some contexts, it is not a recognized shape for signaling a draft constraint. This distinct marking allows for safer navigation by ensuring that vessels are aware of potential limitations, reducing the risk of collision or grounding.