COLREG / ARPA / AIS Bridge
Rule 30(a)
Rule 30(d)
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Rule 30 — Anchored / Aground Lights
NIGHT. You see a stationary vessel showing: a single all-round WHITE light in the fore part; a second all-round WHITE light at or near the stern, lower...
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Scenario briefing
NIGHT. You see a stationary vessel showing: a single all-round WHITE light in the fore part; a second all-round WHITE light at or near the stern, lower than the forward one; and TWO all-round RED lights in a vertical line. Sidelights and sternlight NOT shown. What is her status?
Applicable COLREG rule(s)
Rule 30(a) — referenced in this scenario. Practising this scenario reinforces correct application under realistic time pressure.
Rule 30(d) — referenced in this scenario. Practising this scenario reinforces correct application under realistic time pressure.
Why it matters
COLREG knowledge is the foundation of safe ship handling. Most maritime collisions happen because watchkeepers either misidentified the situation, applied the wrong rule, or acted too late. This scenario lets you train pattern recognition + correct response under time pressure — the exact skill the rules are designed to support. RYA, Yachtmaster, STCW and most national exams expect you to apply COLREGs reflexively, not just recite them.
Related scenarios
About SkipperCheck simulators
SkipperCheck offers two browser-based maritime training simulators:
- ARPA · AIS · COLREG Bridge Simulator — 54 scenarios covering Rules 2, 5–10, 12–19, 23–30, 34 and 35.
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