BOTH INTERNATIONAL & INLAND A power-driven vessel underway in fog making NO way must sound which signal?

Correct Answer: Option B — Two prolonged blasts

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