Racing Rules

Other boats shall comply with the rules of their national authority or class association in regard to the allotment, carrying and size of insignia, letters and numbers. Such rules shall, when practicable, conform to the above requirements.

US SAILING prescribes that unless otherwise stated in her class rules, the sails of a boat that is not in an ISAF International Class or Recognized Class shall comply with rule G1. However, offshore racing boats not in a class that is subject to rule G1 shall carry numbers allotted by US SAILING on mainsails, spinnakers and each overlapping headsail having a luff-perpendicular measurement exceeding 130% of the base of the foretriangle. This rule applies only to a boat whose owner’s national authority is US SAILING. The Sail Numbering System for offshore racing boats in the United States and an application for a sail number are available on the US SAILING website (www.ussailing.org).