Course Outline

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.

WHEN VISIBILITY IS RESTRICTED BY FOG OR SMOKE, ADDITIONAL SOUND SIGNALS ARE REQUIRED:
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.

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