The race committee shall publish written sailing instructions
that conform to
rule J2
.
When appropriate, for an event where entries from other
countries are expected, the sailing instructions shall include, in
English, the applicable national prescriptions.
The sailing instructions may be changed provided the change is
in writing and posted on the official notice board before the
time stated in the sailing instructions or, on the water,
communicated to each boat before her warning signal. Oral
changes may be given only on the water, and only if the
procedure is stated in the sailing instructions.