® | Official Canadian Boating License

Sound Signals - Restricted Visibility

You should use sound signals to alert other boaters to your presence in the area, if visibility is restricted (due to fog, rain etc).

The following are examples of sound signals used in restricted visibility:

Power VesselUnderwayProlonged blast every two minutes.
Sailing VesselUnderwayProlonged blast + two short blasts every two minutes.
Sailing VesselUnderway but
not moving
Two prolonged blasts every two minutes.
Any VesselAnchoredFive seconds of rapid blasts / bell ringing every minute.
Any VesselRun agroundThree bell strokes + five seconds of rapid bell ringing + three bell
strokes every minute.


Boat Captain telling boaters to make noise when in fog.

Study Guide