SI 8.2 updated.  

For Opti’s, Rounding Mark 1 may be a red ball. The Race Committee will verbally inform all Opti’s prior to the warning signal if this is the case.  New Rounding Marks when used in accordance with SI 10.1., Change of Course, will be a yellow ball.

Sailing Instructions are available here.

1. NOR 6.2 has been updated to "If 5 or more races are completed, a boat’s series score shall be the total of her race scores excluding her worst score. If less than 5 races are completed, a boat’s series score shall be the total of her race scores (no throw-outs)."
2. NOR 6.3 (Portsmouth scoring) has been deleted.