🔍 Key Concepts
• Navigation Rules – Rule 34 (Maneuvering and Warning Signals) and Rule 35 (Sound signals in restricted visibility)
• Relationship between Morse code single-letter patterns (dots and dashes) and whistle blast patterns (short and prolonged blasts)
• Which sound patterns are reserved by the Rules and should not be used for general Morse signaling
💭 Think About
• For each letter (E, D, S), write out its Morse pattern and compare it to any whistle signal patterns you know from the Rules (number and length of blasts). Do any of them match a specific Rule signal?
• Ask yourself: if I sent this letter on a whistle, could it be confused with a required maneuvering, warning, or restricted-visibility signal under the Navigation Rules?
• Consider whether the question is asking about one specific letter or whether all listed letters conflict with at least one Rule-defined whistle signal
✅ Before You Answer
• Verify in the Navigation Rules which combinations of short and prolonged blasts are explicitly defined as maneuvering, warning, or restricted-visibility signals.
• For each choice (E, D, S), confirm whether its Morse pattern is identical to one of those defined whistle signals (same order and count of blasts).
• Before choosing “All of the above,” be sure that each individual letter’s pattern is actually used in the Rules, not just one or two of them.