🔍 Key Concepts

• Inland Navigation Rules – special signals in ice-covered waters • Purpose of an icebreaker escort when meeting a downbound vessel in a narrow, ice-filled channel • Difference between stopping, bare steerageway, and normal speed in restricted waters

💭 Think About

• Ask yourself: Why would an icebreaker use a distinctive whistle signal instead of the normal meeting signals in heavy ice? What are they trying to coordinate with you? • Consider which option best supports safe icebreaking operations: Do they need you to be stopped and stationary, moving slowly but controllably, or proceeding as usual? • Think about how an escort normally works in ice: does the assisted vessel typically move to one side and let the icebreaker pass, or adjust speed to be able to follow and respond quickly?

✅ Before You Answer

• Verify which signal (two short, one prolonged, two short) is associated with icebreaker operations/escort in the Inland Navigation Rules or local regulations. • Check which choice keeps you at bare steerageway while ready to adjust speed as the icebreaker begins escorting. • Eliminate any option that suggests taking no action at all in response to a clearly intentional, special-purpose whistle signal.