Narrow Channel Overtaking (Rule 9(e))
You are in a narrow channel overtaking a slower vessel. Rule 9(e)(i): overtaking is only permissible when the overtaken vessel has to take action to all...
Scenario briefing
You are in a narrow channel overtaking a slower vessel. Rule 9(e)(i): overtaking is only permissible when the overtaken vessel has to take action to allow safe passing. In this sim, pass with CPA 0.3 NM while staying between the two dashed yellow channel edges (the channel is 1.4 NM wide do not cross either dashed line).
Applicable COLREG rule(s)
📸 Bridge simulator scene
Captured directly from the SkipperCheck COLREG bridge simulator at scenario T = 0 — the moment the encounter begins.
Key teaching points
- Overtake is only permissible when the overtaken vessel has to take action to allow safe passing (Rule 9(e)(i)).
- Intending to overtake on starboard side: sound — two prolonged + one short. To overtake on port: two prolonged + two short.
- Overtaken vessel agrees by sounding the Morse "C" signal: long-short-long-short.
- Overtaken vessel that doubts the safety of the manoeuvre may sound the doubt signal (five short) — at which point the overtake is OFF.
Common mistakes to avoid
- Overtaking on VHF agreement without the COLREG sound signals. In court the sound signals are the legally-required protocol.
- Overtaking in a bend where the overtaken vessel has no room to manoeuvre to the side — the rule prohibits this.
Why it matters
Exam relevance
Rule 9(e) and the matching Rule 34(c) sound signals are a popular paired oral question for Yachtmaster Coastal/Offshore and STCW OOW candidates.
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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