Safe Boating Course

 

CHAPTER 5: Navigation Rules

WHEN AND HOW TO USE SOUND SIGNALS

When you come within a half-mile of another power-driven vessel, you must use sound signals to let the other vessel know where you intend to go. The initiating vessel indicates the direction they want to go, and the responding vessel either agrees or disagrees.

SOUND SIGNALS

1 short blast (1 second)

I want to pass you on my portleft hand side of a vessel. side (Hint: PORT = 1 syllable = 1 short blast)

2 short blasts

I want to pass you on my starboardright hand side of a vessel. side (Hint: STARBOARD = 2 syllables = 2 short blasts)

3 short blasts

Engine is in reverse

5 short blasts

Danger, or do not understand approaching boat's intentions

1 prolonged blast (4-6 seconds)

Warning:

  • Entering or exiting a blind turn
  • Nearing an obstructed area
  • Leaving a dock or a berth

1 prolonged blast every 2 minutes

Power-driven vessel operating in low or restricted visibility

1 prolonged blast + 2 short blasts every 2 minutes

Sailing vessel operating in low or restricted visibility


 
X