🔍 Key Concepts

• Sound signals in restricted visibility (Navigation Rules, Rule 35) • Different sound signals for underway making way, underway but not making way, anchored, and towing • Special signals for pilot vessels and vessels in danger

💭 Think About

• Think about which type of vessel needs to clearly identify its special status to others in fog using a unique pattern of blasts. • Ask yourself: which of these four options would most need to be distinguished from an ordinary power-driven vessel underway by sound signal alone? • Compare the standard fog signal for a normal power-driven vessel underway with the special patterns for particular services or conditions.

✅ Before You Answer

• Check Rule 35 in the Navigation Rules and match each option (A–D) with its specific fog signal, if any. • Verify what signal is used by a power-driven vessel underway making way versus one underway but not making way so you don't confuse them with a special-category vessel. • Confirm which vessel type uses one prolonged blast followed immediately by two short blasts as its identity signal in restricted visibility.