collisions with other ships. The saltie Francisco Morazan was a total loss after running aground off South Manitou Island on November 29, 1960. Another saltie Nordmeer grounded on Thunder Bay Island Shoal in November 1966, but before it could be refloated, it was further damaged in the same storm that sank the Morrell and was declared a total loss. Ships on the lakes have been involved in many lesser incidents. Lakers have been subject to frequent groundings in ports and channels because of varying lake levels and silting, collisions with objects (such as the 1993 collision of the Indiana Harbor with the Lansing Shoals Light Station), icing in during winter trips and shipboard fires (including the unusual case in 2001 where a drawbridge ran into the Canadian grain carrier Windoc causing a fire). To prevent collisions and groundings, the Great Lakes are well-served with lighthouses and lights, and floating navigation aids. The U.S. Coast Guard and Canadian Coast Guard maintain stations around the Great Lakes including icebreakers and rescue helicopters. The U.S. Army Corps of Engineers and other agencies maintain the harbors and seaways to limit groundings by dredging and seawalling. November was the traditional last month of shipping before the winter layup (and lake freeze-up). During November, much of the worst weather of the navigation season occurs which has resulted in a disproportionate number of accidents. One study shows that over half of all strandings and one-third of all vessels lost to foundering between 1900–1950 were lost during November. Famous vessels The most famous laker was (popularized by Gordon Lightfoot's song "The Wreck of the Edmund Fitzgerald" in 1976), which sank on Lake Superior on November 10, 1975. Edmund Fitzgerald was the first boat with a length of and was the flagship of the Columbia Steamship Division of Oglebay Norton Co. MV Stewart J. Cort was the first of the oreboats. The first laker with self-unloading equipment was Hennepin (formerly George H. Dyer) a small wooden laker that was refitted with the equipment in 1902. The first laker built as a self-unloader was Wyandotte launched in 1908. Before these, all boats were unloaded with shoreside equipment. Self-unloading equipment worked well for cargoes that could "flow" out of the holds onto belts, such as coal and limestone. It did not work well for grain, which flowed too readily and would spill off the conveyors, or iron ore, which would not