COLREG / ARPA / AIS Bridge Rule 12(a) 🔒 Course / Premium

Rule 12 — Sailing vs Sailing

Clear visibility. You are under SAIL with the wind on your PORT side (port tack).

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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

Clear visibility. You are under SAIL with the wind on your PORT side (port tack). A SAILING vessel ahead has the wind on her STARBOARD side (starboard tack). Rule 12(a)(i): when vessels have the wind on different sides, the vessel with the wind on the PORT side shall keep out of the way of the other. You are therefore GIVE-WAY. Make a substantial alteration ( 20°) and achieve CPA 0.3 NM.

Applicable COLREG rule(s)

Rule 12(a) — referenced in this scenario. Practising this scenario reinforces correct application under realistic time pressure.

📸 Bridge simulator scene

Captured directly from the SkipperCheck COLREG bridge simulator at scenario T = 0 — the moment the encounter begins.

SkipperCheck bridge simulator — COLREG Rule 12 — Sailing vessel meeting sailing vessel — radar PPI with AIS targets — Bridge-simulator scene under COLREG Rule 12 — Sailing vessel meeting sailing vessel. Captured from the SkipperCheck COLREG / ARPA / AIS bridge simulator.

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.

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.