Rules World Sailing Case Book

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Rule 20.4
Additional Requirements for Hails

World Sailing Cases for Rule 20
(a) When conditions are such that a hail may not be heard, the boat shall also make a signal that clearly indicates her need for room to tack or her response.

(b) The notice of race may specify an alternative communication for a boat to indicate her need for room to tack or her response, and require boats to use it.