In the definition Zone the distance is changed to two hull lengths.
Rule 18.2(b) is changed to:
If boats are overlapped when the first of them reaches the zone,
the outside boat at that moment shall thereafter give the inside
boat mark-room. If a boat is clear ahead when she reaches the
zone, or she later becomes clear ahead when another boat passes
head to wind, the boat clear astern at that moment shall thereafter
give he mark_room.
Rule 18.4 is deleted.
When stated in the sailing instructions, rule 20 is changed so that
the following arm signals are required in addition to the hails:
for room to tack, repeated and clearly pointing to
windward; and
for 'you tack', repeated and clearly pointing at the other
boat and waving the arm to windward.
Rule 23.1 is changed to: 'If reasonably possible, a boat not racing
shall not interfere with a boat that is racing, and a boat that has
finished shall not act to interfere with a boat that has not finished'.
Add new rule 23.2: 'When boats in different races meet, any
change of course by either boat shall be consistent with complying
with a rule or trying to win her own race'.
add to rule 41:
(e) help from another boat on her team provided electronic
communication is not used.