What does the term 'risk of collision' mean?

The term 'risk of collision' refers specifically to a situation where one vessel is approaching another vessel while maintaining a constant bearing. This means that the two vessels are on a direct path to meet each other, thereby increasing the likelihood of a collision unless action is taken to alter one or both vessels' courses or speeds.

Understanding a constant bearing is crucial because it indicates that if no changes are made, the two vessels will come closer together, potentially leading to a dangerous situation. This principle is particularly important in navigation, where mariners must be vigilant and proactive in managing their courses to prevent collisions.

In contrast, the other options do not accurately describe the risk of collision. For instance, a situation where both vessels are headed for safety does not entail a threat of collision but rather suggests they are successfully avoiding danger. A slight change in course that avoids proximity could indicate an action taken to prevent a collision but doesn’t define the risk itself. Lastly, the presence of navigation markers relates more to guiding vessels safely rather than indicating a collision risk.