COLREGs · Rule 33
Equipment for Sound Signals
TL;DR
12 m+: whistle. 20 m+: whistle + bell. 100 m+: whistle + bell + gong (gong of different tone from bell). Smaller vessels are not obliged to carry these but must have some efficient sound signal.
Authoritative source
- 33 CFR §83.33— verbatim Inland Rule text (US Code of Federal Regulations)
- International COLREGs Rule 33 verbatim text is published by the IMO. The Inland counterpart 33 CFR §83 chunk above mirrors the international wording almost verbatim.
Inland parallel
Inland Rule 33 — Equipment for Sound Signals →More from Part D — Sound and Light Signals
Related drills
- Practise Rule 32 — Sound Signal Definitions
- Practise Rule 34 — Maneuvering and Warning Signals
- Practise Rule 35 — Sound Signals in Restricted Visibility
- Rule 36 — Signals to Attract Attention
Drill COLREGs Rule 33
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