🔍 Key Concepts

• Rule 35 – Sound Signals in Restricted Visibility of the Navigation Rules • Difference between a vessel underway and making way and a vessel underway but stopped • Standard sound signal intervals in restricted visibility (fog)

💭 Think About

• First, recall what sound signal is prescribed specifically for a power-driven vessel underway and making way in fog. Which of these options matches that pattern? • Compare what signal is used for a vessel that is underway but stopped in fog. How does that differ from the signal for a vessel making way? • Look at which of the answer choices uses only prolonged blasts and which introduce short blasts. In Rule 35, when do short blasts get added to prolonged blasts?

✅ Before You Answer

• Verify in Rule 35 that a vessel underway and making way uses only prolonged blast(s) at intervals of not more than 2 minutes • Confirm that the signal with three blasts (mixed prolonged/short) is associated with towing or special conditions, not a simple power-driven vessel making way • Make sure you are not confusing the signal for a vessel stopped with the one for a vessel making way; count the number of prolonged blasts carefully