Part DIntermediate
Rule 36: Signals to attract attention
You may attract attention, but never by creating confusion with regulated signals or AtoN.
Detailed Explanation
If needed to attract attention, any vessel may use light/sound signals that cannot be mistaken for authorized Rule signals. A searchlight beam may be directed toward danger provided it does not embarrass other vessels. Attention lights must not resemble aids to navigation. Avoid high-intensity intermittent/revolving lights (e.g., strobe-like).
Key Points
- May use any signal to attract attention
- Must not be mistaken for a regulated signal
- May direct a searchlight toward a danger
- Never imitate distress or maneuvering signals
Examples
- You suspect a vessel ahead has not noticed your presence. You direct your searchlight beam toward her briefly without dazzling the bridge — Rule 36 permits light signals to attract attention provided they cannot be confused with any prescribed signal.
- A vessel in distress fires an irregular sequence of loud bangs to attract passing ships. Rule 36 allows any sound that cannot be mistaken for a regulated signal; however, distress should use Annex IV signals (Rule 37).
Common Mistakes
- Using a searchlight to attract attention in a way that blinds or endangers the other vessel's bridge team.
- Sounding a signal to attract attention that can be mistaken for a regulated distress or manoeuvring signal.
- Directing a high-intensity light towards shore navigation aids, impairing their visibility to other traffic.