What does the term 'vessel constrained by her draft' refer to?

The term 'vessel constrained by her draft' specifically refers to a power-driven vessel that has a limited ability to maneuver due to the depth of water required for it to float safely. This situation typically arises when a vessel's keel is close to the seabed, restricting its capacity to alter course or speed effectively. Such vessels are unable to navigate in shallow water or to perform sharp turns without risking grounding.

This concept is important within the context of the COLREGs, as vessels that are constrained by their draft are given specific rights and responsibilities, influencing how they interact with other vessels on the water. They often have to navigate through deep draft channels or waterways where their navigational options are limited.

The other choices describe different scenarios that do not accurately reflect the definition of a vessel constrained by its draft. For instance, a vessel restricted by its width pertains to a different type of navigational challenge, while an anchored vessel in shallow water does not qualify as 'constrained by draft' since its ability to maneuver is not being tested. Likewise, a sailing vessel in a narrow channel relates to restrictions due to width and maneuverability in confined areas rather than specifically to draft limitations. Therefore, option A accurately encapsulates the meaning of a vessel constrained by her draft