What does "Constrained By Draft" (CBD) refer to?

"Constrained By Draft" (CBD) refers specifically to a situation in which a vessel's ability to navigate is limited by its draft, meaning the vertical distance between the waterline and the bottom of the hull. This term is typically applied to vessels that require deep water to operate safely, as they cannot navigate in shallower regions without the risk of grounding.

When a vessel is constrained by draft, it must follow specific navigational rules that recognize its limitations and provide it with the right of way over other vessels that are not similarly constrained. This ensures safe navigation through narrow channels or shallow areas where only certain types of vessels can safely operate.

The other options, while related to maritime topics, do not capture the specific definition of CBD. Power-driven vessels refer to the types of vessels but do not indicate the navigational constraints posed by their draft. International waters and weather conditions are broader concepts that influence navigation but are not directly linked to the definition of being 'constrained by draft'. The focus of CBD is solely on the draft of a vessel and its implications for safe navigation.