What does CBD mean in maritime contexts?

In maritime contexts, CBD stands for "Constrained By Draft." This term is used to describe a situation where a vessel's ability to maneuver is restricted due to its draft relative to the depth of the water. Specifically, it applies to vessels that are large and deep-drafted, which have limitations on their ability to safely navigate through shallow waters or narrow channels.

When a vessel is constrained by draft, it is often near its maximum draft for the depths available, which means it cannot take the freedom of maneuvering, such as changing course or speed, as would usually be possible. This definition reflects the important navigational considerations that mariners must take into account to ensure safe passage, particularly in areas with varying depths or obstacles.

The other options do not accurately represent the maritime terminology related to vessel movement and navigation constraints. Thus, understanding the specific meaning of "Constrained By Draft" is essential for safe navigation practices, particularly in restricted waters.