While being assisted by an icebreaker on...

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Question 1 of 2066636ee728f7522a1c51752b

While being assisted by an icebreaker on Lake Superior, you receive a single letter code instructing you to slow your vessel. Which signal could you use to signify that you are complying with the request?

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Question 1 of 20

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🔍 Key Concepts

• Great Lakes Icebreaking communications procedures in the Coast Pilot or local regulations • Meaning and use of single-letter sound signals under ice conditions • Difference between international code flags and sound signals for maneuvering/ice operations

💭 Think About

• Ask yourself: the icebreaker sent you a single letter code to slow down—are you more likely to acknowledge compliance by whistle signal or by hoisting a flag in close-quarters ice operations? • Consider which option looks like a standard maneuvering or answering signal rather than a danger or special condition signal. • Think about which signal could reasonably be understood and executed quickly from the bridge while following an icebreaker in a track.

✅ Before You Answer

• Check which of the options is actually a single-letter sound signal used to indicate compliance or understanding, not a request. • Verify the meanings of code flag A (Alpha) and code flag L (Lima) in the International Code of Signals and ask if either makes sense as “I am complying.” • Make sure the blast pattern (number and sequence of short/long blasts) you choose is practical and recognizable as a replying or answering signal in restricted waters.

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