Which rule requires you to assess the risk of collision?

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Assessing whether there is a risk of collision is the crucial step that begins the collision avoidance process. You must continuously monitor other vessels and use all available means to judge whether their approach could put you in danger. If a risk exists, you’re obligated to take early and clear action to avoid collision rather than waiting for it to become imminent. This ruling is specifically about evaluating potential danger and initiating the response. Other rules cover related duties—keeping a proper lookout, maintaining a safe speed, and taking effective action to avoid collision when risk is present—but the requirement to determine if a risk exists is what starts the sequence of proper actions.