What is meant by "Constrained By Draft" (CBD)?

"Constrained By Draft" (CBD) refers specifically to a situation where a vessel’s draft, which is the vertical distance between the waterline and the bottom of the hull (keel), limits its ability to maneuver within navigable waters, particularly when in shallow areas. This condition often arises in deep-draft vessels that require certain depths of water for safe navigation. When a vessel is constrained by draft, it may not be able to change course or navigate away from a given position without risking grounding or sustaining damage due to insufficient water depth.

The concept is essential in maritime navigation as it establishes the limitations a vessel faces in shallow waters and recognizes its specified status. This status grants certain navigation rights according to maritime regulations, emphasizing the need for awareness from other vessel operators in the vicinity to ensure safe navigation and prevent collisions.

Other options, while relating to navigation in some respects, do not accurately describe the specific condition of CBD. For instance, being at shallow water pertains more generally to water depth rather than the navigational constraints caused by draft. Similarly, being fully loaded with cargo does not necessarily imply a draft constraint, as vessels can have various drafts depending on loading conditions. Temporary mooring relates to a vessel's status rather than its draft-related navigation abilities