COLREG / ARPA / AIS Bridge Rule 19(d)(ii) 🔒 Course / Premium

RV — Target Abaft Port Beam (Rule 19(d)(ii))

Target detected abaft your port beam, slowly closing (relative bearing ~160 port / ~200 true from your heading).

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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

Target detected abaft your port beam, slowly closing (relative bearing ~160° port / ~200° true from your heading). AIS identifies her as a SAILING vessel (badge "S"). Note: in clear visibility Rule 18(a)(iv) would make YOU the give-way vessel, but in RESTRICTED VISIBILITY Rule 19 applies to every vessel there is NO stand-on/give-way. Rule 19(d)(ii): avoid alteration TOWARD a vessel abeam or abaft the beam. A port alteration here is prohibited; consider a starboard turn or a speed change.

Applicable COLREG rule(s)

Rule 19(d)(ii) — 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.

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