🔍 Key Concepts
• Sound signals in restricted visibility for power-driven vessels and vessels at anchor (Navigation Rules, Rule 35)
• Difference between underway making way, underway not making way, and at anchor sound signals
• What types of signals are given by a vessel at anchor vs. a vessel underway (whistle vs. bell vs. horn)
💭 Think About
• Ask yourself: In dense fog near a reef light, are you more likely to be meeting a moving vessel or one that is anchored or aground near the hazard?
• Think about which sound-producing devices (bell, whistle, horn) are typically associated with a vessel at anchor, and which with a vessel underway in restricted visibility.
• Consider whether the relative bearing (e.g., 075° relative, 330° relative) affects the type of sound signal, or only the direction it comes from.
✅ Before You Answer
• Review Rule 35 for anchor signals (what instrument and pattern are used).
• Verify which of the listed options (bell, whistle, horn) is the normal signal device for a vessel at anchor in fog.
• Confirm that nothing in the question changes the basic Rule 35 requirements (e.g., your own heading or exact position do not alter what another vessel must sound).