🔍 Key Concepts

• Sound signals in restricted visibility under Rule 35 of the Navigation Rules • Difference between maneuvering/whistle signals (like overtaking or leaving a dock) and fog signals • Which vessels at anchor or underway use prolonged vs short blasts in fog

💭 Think About

• Ask yourself: In fog, are we usually signaling our maneuver intentions or simply our presence and status? • Look at the pattern: one short, one prolonged, one short. Does that look more like a standard fog signal for a vessel’s status, or a special/emergency signal? • Think about which type of vessel listed in the choices is most likely to need a distinct, recognizable signal to mark its fixed position in fog.

✅ Before You Answer

• Verify in Rule 35 which sound signals are assigned to vessels at anchor versus vessels underway or making way • Check whether there is any special fog signal for distress situations in the Rules (compare with the separate list of distress signals in another rule/annex) • Confirm whether vessels towing or fishing have unique fog signals different from the standard power-driven vessel signal