Horn / Whistle component card: Electric / air-powered. COLREGs Rule 33 compliant.
Formula
$$ \text{System} = \text{Horn / Whistle} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $Horn / Whistle$ | Electric / air-powered | - | class rule + maker |
Sources
- Class society rules + system OEM.