COLREGs Rules of the Road Practice Test 2026 - Free Maritime Navigation Practice Questions and Study Guide

A vessel constrained by her draft refers specifically to a power-driven vessel that has limitations imposed on her ability to navigate due to her draft, which is the vertical distance between the waterline and the bottom of the hull (keel). This situation often arises when a vessel is in shallow water, where the depth is not sufficient for her draft, thus restricting her movements and ability to maneuver safely.

This condition is a critical part of maritime navigation, as it affects how and where a vessel can operate safely to avoid grounding. It's important to recognize that being constrained by draft is a well-defined category under the COLREGs, which sets out rules for vessels in various scenarios to ensure safe navigation and to avoid collisions.

In this context, the other choices address different situations: the second option concerning a sailboat relates to limitations caused by wind conditions, which is not about draft constraints. The third option describes a more general inability to maneuver, which could apply to many situations, not specifically to draft. Lastly, a vessel at anchor is not necessarily constrained by her draft; instead, it is simply stationary. Thus, the correct choice accurately captures the specific meaning of being constrained by draft.