1980's or newer boat of epoxy resin and fully cored construction. Some older and well-cared-for Lindsays and Hamlins could also be considered a Category 3 boat. Could be competitive at the local, regional, and national level in the right hands. Typically requires some significant amount of rigging work to be competitive at the regional and national level. May not have the latest mast, foils, or sails which would set it apart from a Category 4 boat.