🔍 Key Concepts

• Red sidelight relative bearing and what it tells you about the other vessel's heading • Who is the stand-on vessel and who is the give-way vessel in an overtaking, crossing, or meeting situation • When the Rules require you to maintain course and speed versus take early and substantial action

💭 Think About

• If you see only a red sidelight well off your port bow, where roughly is the other vessel in relation to your own heading? Ahead, crossing left-to-right, or right-to-left? • Does seeing only the red sidelight (and not the masthead or green sidelight) guarantee that you are on a collision course? Why or why not? • In a crossing situation, which vessel is required to keep out of the way, and does that match the description given in the question?

✅ Before You Answer

• Confirm what red sidelight alone (no masthead, no green) indicates about the aspect of the other vessel • Check Rule 15 (Crossing) and Rule 16–17 to recall who is give-way and who is stand-on when you see a vessel to your starboard vs port side • Verify that none of the options require action that is more extreme than the Rules call for in a normal crossing situation