COLREG / ARPA / AIS Bridge Rule 9(a) 🔒 Course / Premium

Narrow Channel — Keep Starboard (Rule 9(a))

You are transiting a narrow channel marked by the two dashed yellow lines on the PPI.

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This scenario is part of the full library. Unlock all 54 COLREG scenarios with the Skipper Refresher Course (€99.99, lifetime + certificate) or a Premium subscription (from €29.99/mo).

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Scenario briefing

You are transiting a narrow channel marked by the two dashed yellow lines on the PPI. Rule 9(a): keep as near to the outer limit of the channel on your STARBOARD side as is safe and practicable. Maintain your position east of the channel centreline (x > 0) while transiting.

Applicable COLREG rule(s)

Rule 9(a) — 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.

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