Class А – All square–rigged vessels (barque, barquentine, brig, brigantine or ship rigged) and all other vessel more than 40m Length Overall (LOA).
Class В – Traditionally rigged vessels (i.e. gaff rigged sloops, ketches, yawls and schooners) with an LOA of less than 40m and a waterline length (LWL) of at least 9.14m.
Class С – Modern rigged vessels (i.e. Bermudan rigged sloops, ketches, yawls and schooners) with an LOA of less than 40m, a waterline length (LWL) of at least 9.14m and no spinnaker.
Class D – Modern rigged vessels (i.e. Bermudan rigged sloops, ketches, yawls and schooners) with an LOA of less than 40m, a waterline length (LWL) of at least 9.14m and spinnaker.