COLREG / ARPA / AIS Bridge
Rule 24(a)
Rule 24(a)(i)
🔒 Course / Premium
Rule 24(a)(i) — Tow > 200 m
NIGHT. A towing vessel shows: THREE masthead lights in a vertical line on the forward mast; sidelights; sternlight; YELLOW towing light above the...
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Scenario briefing
NIGHT. A towing vessel shows: THREE masthead lights in a vertical line on the forward mast; sidelights; sternlight; YELLOW towing light above the sternlight. What does the THREE-vertical masthead configuration tell you?
Applicable COLREG rule(s)
Rule 24(a) — referenced in this scenario. Practising this scenario reinforces correct application under realistic time pressure.
Rule 24(a)(i) — 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.