🔍 Key Concepts

• Rule 35 – Sound Signals in Restricted Visibility (what each pattern of prolonged and short blasts means) • The difference between signals for power-driven vessels, towing vessels, and vessels not under command or aground in fog • How ‘being towed’ is signaled compared to the vessel that is doing the towing

💭 Think About

• Look up which vessels in restricted visibility use the pattern: one prolonged blast followed by two short blasts, and think about what they have in common (if anything). • Ask yourself: Do vessels not under command or aground have a distinct fog signal that is different from normal power-driven or towing signals? • Consider whether ‘being towed’ has its own fog signal, and whether that signal is the same as for any other special category of vessel.

✅ Before You Answer

• Verify in Rule 35 which sound signal pattern (1 prolonged + 2 short) is assigned to specific types of vessels (e.g., constrained by draft, restricted in ability to maneuver, fishing, towing, etc.). • Double‑check whether aground and not under command use the same fog signal as ‘being towed’ or have different required signals. • Confirm whether more than one of the listed vessel types actually uses this exact fog signal before deciding if ‘all of the above’ is possible.