The following guidelines for sailing are for off-the-beach craft only. Small, open off-the-beach sailing craft include dinghies (monohulls) and catamarans (with two hulls). Off-the-beach craft are fitted with centreboards and require the skipper and/or crew to act as ballast. Separate guidelines have been developed for Windsurfing, Water Skiing, Canoeing, and Sea Kayaking.