COLREG / ARPA / AIS Bridge
Rule 27(f)
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Rule 27(f) — Mineclearance Vessel
NIGHT. A warship displays normal PDV lights (masthead + sidelights + sternlight) AND in addition THREE all-round GREEN lights one at the foremast head a...
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Scenario briefing
NIGHT. A warship displays normal PDV lights (masthead + sidelights + sternlight) AND in addition THREE all-round GREEN lights one at the foremast head and one at each end of the fore yard. Identify her duty and the danger zone to avoid.
Applicable COLREG rule(s)
Rule 27(f) — 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.
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