The rules listed in the definition Rule apply to races governed by The Racing Rules of Sailing whether or not the notice of race or sailing instructions explicitly state that they apply. A sailing instruction, provided it is consistent with any prescription to rule 88.2, may change some or all of the prescriptions of the national authority. Generally, neither the notice of race nor the sailing instructions may change a class rule. When a boat races under a handicapping or rating system, the rules of that system apply, and some or all of her class rules may apply as well. When the notice of race conflicts with the sailing instructions, neither takes precedence.