Case 7: In the photo below, what rule does 442 appear to be breaking?

Answer:
442's boom end appears to be touching a rounding mark, so he is breaking rule 31. Under rule 44 (Penalties at the Time of an Incident), he now needs to immediately get well clear of all other racing boats and do a One-Turn Penalty. Here, with no other boats nearby, 442 can probably just wait for 739 to proceed and then do his Penalty around the mark if he likes, but a turn around the mark is not required.

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