COLREG / ARPA / AIS Bridge Rule 17(a)(ii) Rule 17(b) 🔒 Course / Premium

Stand-On — Last-Moment Action (Rule 17(b)(c))

Crossing situation target on your PORT quarter/beam is the give-way vessel but is NOT altering.

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Scenario briefing

Crossing situation target on your PORT quarter/beam is the give-way vessel but is NOT altering. Rule 17(a)(ii): as stand-on you may take action when it becomes apparent the other is not acting. Rule 17(b): when collision cannot be avoided by give-way alone, take best action. Rule 17(c): if you do alter, do NOT turn to PORT for a vessel on your own port side.

Applicable COLREG rule(s)

Rule 17(a)(ii) — referenced in this scenario. Practising this scenario reinforces correct application under realistic time pressure.

Rule 17(b) — referenced in this scenario. Practising this scenario reinforces correct application under realistic time pressure.

📸 Bridge simulator scene

Captured directly from the SkipperCheck COLREG bridge simulator at scenario T = 0 — the moment the encounter begins.

SkipperCheck bridge simulator — COLREG Rule 17(b)(c) — Stand-on — last-moment action — radar PPI with AIS targets — Bridge-simulator scene under COLREG Rule 17(b)(c) — Stand-on — last-moment action. Captured from the SkipperCheck COLREG / ARPA / AIS bridge simulator.

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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