Part B-IIBasic
Rule 11: Section II application
Section II applies only when vessels are visually in sight of each other.
Detailed Explanation
Rules 11 to 18 govern in-sight encounters. If vessels are not in sight and restricted visibility exists, Rule 19 is the governing framework.
Key Points
- Section II requires vessels to be in visual contact
- No visual sight in fog → apply Rule 19 instead
- Even with radar: if you cannot see them, use Rule 19
Examples
- Two cargo vessels see each other's navigation lights at 4 miles. They are in sight of one another, so Rules 11-18 govern the encounter — not Rule 19.
- In patchy fog a vessel intermittently appears and disappears visually. Until positive visual contact is confirmed and sustained, you must still comply with Rule 19 rather than Section II.
Common Mistakes
- Applying crossing or overtaking rules (Section II) to a radar-only target in fog instead of using Rule 19.
- Forgetting that 'in sight' means visual contact only, not radar or AIS detection.