COLREG / ARPA / AIS Bridge Rule 31 🔒 Course / Premium

Rule 31 — Seaplane on the Water

NIGHT. You see on the water a vessel which is unable to comply fully with Rule 23 due to its construction.

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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

NIGHT. You see on the water a vessel which is unable to comply fully with Rule 23 due to its construction. She exhibits lights of the characteristics, positions and visibilities as closely as possible to those prescribed for a power-driven vessel but not exactly. What is she most likely to be?

Applicable COLREG rule(s)

Rule 31 — 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.