The Mariner 40 is a ketch-rigged boat, which means it has two masts: a main mast and a mizzen mast. The main mast carries a mainsail and a headsail (either a jib or a genoa), while the mizzen mast carries a mizzen sail and sometimes a mizzen staysail. The advantage of a ketch rig is that it offers more flexibility and balance in different wind conditions, as well as more sail area and redundancy in case of damage. The disadvantage is that it adds more weight, complexity and cost to the boat. The Mariner 40 has different sailplan options depending on the year and model of the boat. Some of the variations include different mast heights, boom lengths, sail areas, reefing systems, roller furling devices, etc.