What is meant by "action to avoid collision" being described as "large and apparent"?

The phrase "action to avoid collision" being described as "large and apparent" emphasizes the need for any maneuvers taken to be easily noticeable to other vessels nearby. This characteristic is crucial for ensuring that other mariners can clearly perceive the actions being undertaken to prevent collisions, which helps maintain safety and prevent misunderstandings at sea. For instance, if a vessel changes course or speed in a way that is dramatic and clearly visible, it communicates an intent to avoid conflict, reducing the risk of accidental collisions.

In contrast to this understanding, options that suggest subtlety, timing until the last moment, or actions limited to high speeds do not align with the principle of clarity in navigational safety. Subtle actions might not be seen and could lead to confusion rather than resolving the situation effectively. Additionally, waiting until the last moment to avoid collision can increase the risk of an incident. Likewise, the notion that avoidance actions can be limited to high speeds does not encapsulate the fundamental need for visibility and clear communication in maritime navigation.