(Based on the January 2013 RYA Guidance Note)

KEEP CLEAR: This defines when a boat keeps clear of a right-of-way boat. It has been extended to cover any overlapped, keep-clear boat whether that is a windward boat or a port-tack boat, normally running alongside a starboard tack boat.
ROOM: It is now clear that, where more than 2 boats are involved, a boat required to give room must give space for all boats affected to comply with the rules.
MARK-ROOM: re-written so that a keep-clear boat (for example, an overlapped, windward boat which is also the inside boat at a mark-rounding and therefore entitled to mark-room) only gets room for a seamanlike rounding and not room to sail her proper course.


18.2(c)(2) is new. It is intended to discourage barging in at a mark – a boat required to give mark-room which subsequently becomes overlapped inside the boat entitled to mark-room shall give the entitled boat room to sail her proper course.
18.3 Tacking in the Zone: rule now applies if any of a number of boats affected is forced to sail above close-hauled.
20 Room to Tack at an Obstruction: Rules 18 and 19 no longer switched off when 20 applies. One exception – 20.2(e) – ensures that a boat hailing for room to tack is given that room despite any simultaneous obligation to give mark-room to another boat. (e.g. at PH mark when 2 overlapped port boats in the Zone approach a starboard boat).
21 Exoneration: combines old rules 18.5 and 20.2 into new, simplified rule. Adds exoneration for a boat that is not given room under rule 19 (Room to Pass an Obstruction) and for one compelled to break rule 31 (Touching a Mark) because she was not given mark-room.
22.3 Moving Astern: clarified to refer to a boat moving astern through the water if not over the ground.
25.3 Race Signals: makes clear that the visual signal does not have to be a flag – e.g. could be a board or lights.
28 Sailing the Course and Finishing: Clarifies that a line through which boats must pass at the end of each lap is not a finishing line until the boats have sailed the required number of laps. Also means boats must pass correct side of start-line limit marks even if they are well on the pre-start side of the line.
42.3 Exceptions to the Propulsion Rule:
(c) now refers to pulling in a sail rather than a sheet for the one permitted pump per wave
(e) is new and permits crew to pump a sail to reverse an inverted sail batten provided it does not clearly propel the boat.

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