What action must the stand-on vessel take if the give-way vessel does not take appropriate action?

The correct answer is to maintain its course and speed. In navigation, the stand-on vessel is the one that has the right of way and is expected to continue its current path without any changes. If the give-way vessel fails to take action to avoid a collision, the stand-on vessel should not change course or speed suddenly, as doing so could create confusion and increase the risk of an accident.

This principle is fundamentally about maintaining predictability on the water. When the stand-on vessel keeps its course and speed, it allows the give-way vessel to make the necessary adjustments to avoid a collision. It is essential that both vessels understand their responsibilities to navigate safely within the waterways.