Fog Signals (Rule 35)
Rule 35 of the COLREGs specifies sound signals in restricted visibility. A power-driven vessel making way: one prolonged blast (4–6 seconds) every 2 minutes. A power-driven vessel stopped: two prolonged blasts every 2 minutes.
A sailing vessel, vessel fishing, vessel towing, NUC, or RAM: one prolonged + two short blasts every 2 minutes. A vessel at anchor: rapid ringing of bell for 5 seconds every minute. A vessel aground: three distinct strokes of bell before and after the rapid ringing.
Key Points
- Power vessel making way: 1 prolonged blast / 2 min
- Power vessel stopped: 2 prolonged blasts / 2 min
- Sailing / fishing / NUC / RAM: 1 prolonged + 2 short / 2 min
- At anchor: rapid bell ringing for 5 sec / 1 min
- Aground: 3 bell strokes + rapid ringing + 3 bell strokes / 1 min