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.
This scenario is part of the full library.
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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.
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.
- VHF SRC Radio Simulator — 15 scenarios: voice Mayday, DSC distress, Mayday Relay, Pan-Pan, Sécurité, routine.
Both run in any modern browser, on desktop or mobile. No install, no plugins.