The Northeast Harbor Fleet cooperatively owns and maintains twenty one 420s within the Great Harbor Dream cooperative. The boats are used for the high school, sailing schools of MDI, and for recreational use by NEHF members.
The 420 is a two person planing dinghy with centerboard, jib, and spinnaker. The name describes the overall length of the boat: 420 centimeters (13' 9"). The hull is fiberglass with internal buoyancy tanks and is equipped with an optional trapeze, making teamwork necessary to sail it well. It has a large sail-area-to-weight ratio, and is designed to plane easily. The 420 was designed by French engineer Christian Maury in 1959. The 'Turbo' 420, as redesigned by Fleet manager Fran Charles is faster because it is lighter, stronger because it is cored, and safer because the boom is higher and lighter than the original design.