COLREG / ARPA / AIS Bridge Rule 30(a) Rule 30(d) 🔒 Course / Premium

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.

📸 Night recognition — 8 aspects

The same vessel rendered every 45° of aspect — bow, starboard bow, beam, quarter, stern, port quarter, beam, bow. Use this strip to learn how the lights present from each approach angle. Click any image to view full size.

Vessel at anchor viewed head-on (bow aspect) — COLREG Rule 30 night-recognition diagram — Bow

Vessel at anchor viewed from her starboard bow — COLREG Rule 30 night-recognition diagram — STBD bow

Vessel at anchor viewed from her starboard beam — COLREG Rule 30 night-recognition diagram — STBD beam

Vessel at anchor viewed from her starboard quarter — COLREG Rule 30 night-recognition diagram — STBD qtr

Vessel at anchor viewed dead astern (stern aspect) — COLREG Rule 30 night-recognition diagram — Stern

Vessel at anchor viewed from her port quarter — COLREG Rule 30 night-recognition diagram — Port qtr

Vessel at anchor viewed from her port beam — COLREG Rule 30 night-recognition diagram — Port beam

Vessel at anchor viewed from her port bow — COLREG Rule 30 night-recognition diagram — Port bow

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.

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