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The Great Lakes Area........ 4 How Navigational Locks Operate .. me The St. Mary’s Falls Canal .... 6 The Sault Ste. Marie Ontario Ship Canal. . 7 The Welland Canal. . . . 7 The St. Lawrence Seaway .... 8 ee 9 5 Index to Lake Fleet. . A Salty Problem .... Owners and Managers of Lake Vessels.............. 28 M.V. Goodtime entering the main channel of the Cuyahoga River, passing under ‘‘the Iron Curtain’’ (Conrail No. 1) - (Pansch-Gris PA - 1960) Photo by Al Sweigert Nautical Terms ............. 44 American and Canadian Stack Markings .....45, 46, 47 International Flags .. 48, 49 Foreign Stack Markings «200; 91,52, Talking Lights . Meaning of Boat Whistles sgiweis@rens Back Inside Cover Nautical Measurements ee 3 esa eves Back Inside Cover 53 54