Sound signals
Short blast about 1 second, prolonged 4 to 6 seconds.
| Signal | Meaning |
|---|---|
| 1 short | Altering to starboard |
| 2 short | Altering to port |
| 3 short | Operating astern propulsion |
| 5+ short | Doubt / danger |
Lights
Arcs.
| Light | Arc |
|---|---|
| Masthead | 225° |
| Sidelights | 112.5° each |
| Sternlight | 135° |
| All-round | 360° |
Encounters
Who gives way.
| Situation | Action |
|---|---|
| Overtaking | Overtaker keeps clear |
| Head-on | Both alter to starboard |
| Crossing | Vessel with the other on its starboard gives way |
⚠️ Reference only. Always verify against the manufacturer's specs, your jurisdiction's code and your site's procedures.