Navigation lights
78 cardsRecognise any vessel by her lights — night views from every informative aspect, straight from Rules 21–30.
View all cardsTrainer · COLREGs
COLREGs Trainer
Recognition, rules, and decision practice for the COLREGs — free, aligned to the MCA syllabuses, not MCA-approved.
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.
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- Rules
- 41
- Decks
- 6
- Cards
- 177
- Scenarios
- 10
1
Rules
Contains public sector information reproduced under the Open Government Licence v3.0.
2
Recognition decks
6 decksAll decks ↗
Day shapes
9 cardsThe shape-carrying statuses — balls, cones, cylinders and diamonds from Rules 24–30.
View all cardsSound signals
20 cardsManoeuvring, warning and restricted-visibility signals — Rules 34–37, patterns rendered as blast notation.
View all cardsDistress signals
16 cardsAnnex IV, item by item and verbatim — the current text including DSC and EPIRB alerts.
View all cardsMorse code
36 cardsA–Z and 0–9 per the ITU-R M.1677 international Morse alphabet. Runs pattern→character; reversible in the player.
View all cardsIALA buoyage
18 cardsThe IALA Maritime Buoyage System — laterals in both regions, preferred channels, cardinals, and the rest of the family. Original teaching content; system facts verified against IALA/NGA/Trinity House guidance.
View all cards3
Encounter simulator
Ten live encounters at 30×, paused at the decision point — choose your action as the officer of the watch and get an examiner's debrief.
10 scenarios
01Head-on, reciprocal coursesHead-on02Crossing — vessel on your starboard bowCrossing — give way03Crossing — vessel on your port bowCrossing — stand on04Overtaking a slower vesselOvertaking05Being overtakenBeing overtaken06Stand-on — give-way vessel not actingCrossing — stand on07Fine crossing — head-on in doubtCrossing — give way08Overtaking or crossing? The 22.5° boundaryBoundary doubt09Two targets — keep one clear without embarrassing the otherCrossing — give way10Crossing give-way — constrained sea room to starboardCrossing — give way