Rule 42.3, Propulsion
Changes have been made in three of the subsections of Rule 42.3. In Rule 42.3(c), the exception that allows one pump to initiate surfing or planing has been clarified and made slightly more generous. Under the old wording, you could pull the mainsheet in once to initiate surfing, but you were not permitted to pull directly on the main boom itself or to pull on any line attached to the boom other than the mainsheet. Now you may pull the mainsail in once using any means you like. Under the old rule, it was not clear whether you were permitted to pump the guy of a spinnaker once and then pump the sheet to initiate surfing a given wave, or whether you were limited to just one pump. The new rule is clear on this point—you may pump the sail once. Therefore, you may pump once on the sheet, or once on the guy, or once on both sheet and guy simultaneously. But, on a given wave, any additional pump made after the first pump breaks Rule 42.