🔍 Key Concepts

• Rule 9 – Narrow Channels (Navigation Rules) • Meaning of a vessel that "can only be safely navigated within a narrow channel" • Obligation of vessels crossing a narrow channel versus vessels using the channel

💭 Think About

• Ask yourself: In a narrow channel, who has priority—vessels that must stay in the channel, or vessels that are just crossing it? • Think about whether your crossing could force the channel-bound vessel to slow, stop, or alter course sharply. • Consider which action best avoids impeding the safe passage of the vessel that must remain in the channel.

✅ Before You Answer

• Verify what Rule 9 says about vessels crossing a narrow channel and their duty toward vessels that can safely navigate only inside the channel. • Check which option directly avoids impeding the vessel constrained to the channel, rather than just signaling or assuming it will maneuver for you. • Confirm that any sound signals or passing arrangements come after you’ve first met your basic obligation not to interfere with that vessel’s safe passage.