BOTH INTERNATIONAL & INLAND While underway your vessel enters fog. You stop your engines and the vessel is dead in the water. Which fog signal should you sound?

Correct Answer: Option A — Two prolonged blasts every two minutes

Rule 35(b) states that a power-driven vessel underway but stopped and making no way through the water shall sound two prolonged blasts in succession with an interval of about two seconds between them, at intervals of not more than two minutes. This distinguishes her from a vessel making way.