Operating in Restricted Visibility
During periods of restricted visibility (such as rain, mist, heavy fog, or hours of darkness), you should slow to minimum speed to give your vessel an opportunity to maneuver should the risk of a collision arise.
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| WHEN VISIBILITY IS RESTRICTED BY FOG OR SMOKE, ADDITIONAL SOUND SIGNALS ARE REQUIRED: |
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| VESSEL TYPE |
SITUATION |
SOUND REQUIREMENT |
| Power Vessel |
Underway |
Prolonged blast every 2 minutes |
| Sailing Vessel |
Underway |
Prolonged blast + two short blasts every 2 minutes |
| Power Vessel |
Underway but not moving |
Two prolonged blasts every 2 minutes |
| Any Vessel |
Anchored |
5 seconds of rapid bell ringing every minute |
| Any Vessel |
Run aground |
3 bell strokes + 5 seconds of rapid bell ringing + 3 bell strokes every minute |
Unless the risk of a collision is present, you should reduce your speed to the minimum you need in order to keep on course when you hear any of the sound signals above.