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CEVNI module 4 of 9

Sound Signals

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

long blastsshort blastsmanoeuvring signalsvisibility

What to know for Sound Signals

Match common inland sound signals to vessel intentions or warnings.

Long and short blasts, manoeuvring intentions, warning signals, and poor visibility discipline. This module is mapped to the published course boundary for CEVNI and Inland ICC Revision and written as an independent revision aid, not official training material.

Key Points

  • Sound signals must be recognised immediately
  • They may indicate turning, overtaking, danger, or visibility actions
  • Context matters: lock, bend, bridge, or narrow channel
  • When uncertain, slow down and keep clear

Last reviewed: 6 July 2026 by Compass Revision curriculum review

Source notes

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