COLREG / ARPA / AIS Bridge Rule 35(a) Rule 35(b) 🔒 Course / Premium

Rule 35(a) — PDV Underway in Fog

FOG. Visibility 0.3 NM. You are a power-driven vessel MAKING WAY through the water.

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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

FOG. Visibility 0.3 NM. You are a power-driven vessel MAKING WAY through the water. Rule 35 requires you to sound specific signals at intervals of NOT MORE than 2 minutes. Which signal applies?

Applicable COLREG rule(s)

Rule 35(a) — referenced in this scenario. Practising this scenario reinforces correct application under realistic time pressure.

Rule 35(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.