Which COLREGs rule requires you to take early and substantial action to avoid collision?

Prepare for the COLREGs Scenarios Test. Enhance your maritime navigation skills with interactive simulations, multiple choice questions, and detailed explanations. Ace the test with thorough practice!

Taking early and substantial action to avoid collision is the rule that directly governs how you respond when there’s a risk of a collision. It emphasizes acting promptly and with enough maneuver to create a safe separation rather than waiting to see what the other vessel will do or making only a small adjustment. When you determine there is a risk of collision (using all available means), you must take action to avoid it, and you should do so well in advance so the other vessel has time to respond as well. The kinds of actions you might take include altering course, reducing speed, or both, chosen to achieve safe clearance.

The other options describe related ideas but not the specific obligation to act. One is about determining whether a risk exists, not the required maneuver to avoid it. Another concerns identifying vessels in sight, which helps you assess who you’re dealing with, not the action you must take. The last refers to navigating in a narrow channel, which involves special precautions but not the general requirement to take early and substantial action to avoid collision.