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CEVNI revision module 4 of 9

SND

Sound Signals

Long and short blasts, manoeuvring intentions, warning signals, and poor visibility discipline.

long blastsshort blasts

4 guided lessons · 8 practice questions · 8 flashcards

3 outcomes · self-guided revision
  • Explain long and short blasts, manoeuvring intentions, warning signals, and poor visibility discipline.
  • Apply long blasts to a realistic onboard situation.
  • Recall the core check: short and long blasts have distinct meanings.

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Lesson 1 of 1

What Sound Signals Do

Sound signals are used when visual recognition is not enough: manoeuvring near other vessels, limited visibility, blind bends, bridges, locks, warning situations, and local instructions.

In CEVNI revision, learn the signal as a communication act. A sound signal should tell other traffic what you are doing, warn them of risk, or comply with a waterway instruction.

  • Short and long blasts have distinct meanings.
  • Signals can be manoeuvring, warning, visibility, or instruction-based.
  • Use signals early enough to be useful.
  • Do not invent private meanings.
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