"MCAORALS" is very helpful for revising YM theory etc,has a slightly higher (commercial) standard so for me at least made the YM colregs Q`s relatively easy,good luck
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though i can't make out what I'm supposed to do in the cardinal mark 'game'.
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Click on a mark, and drag it with mouse to correct location. Continue until all marks are in what you think are correct places. You will be told if you are correct or not