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COLREGs Encounter Simulator
Ten live encounters, plotted north-up with real DCPA and TCPA. Each scenario runs at 30× and pauses at the decision point — choose your action as the officer of the watch, get the deterministic verdict, then an examiner's debrief. Two power-driven vessels, open water, good visibility.
Independent preparatory study aligned to the MCA OOW (Yachts <3000 GT) oral examination syllabus. Not an MCA-approved course and confers no credit toward a Certificate of Competency.
Sign in to track progress — you can run every scenario without an account.
01Head-on, reciprocal courses
Head-on
02Crossing — vessel on your starboard bow
Crossing — give way
03Crossing — vessel on your port bow
Crossing — stand on
04Overtaking a slower vessel
Overtaking
05Being overtaken
Being overtaken
06Stand-on — give-way vessel not acting
Crossing — stand on
07Fine crossing — head-on in doubt
Crossing — give way
08Overtaking or crossing? The 22.5° boundary
Boundary doubt
09Two targets — keep one clear without embarrassing the other
Crossing — give way
10Crossing give-way — constrained sea room to starboard
Crossing — give way