Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. USRC Mackinac, later USCGC Mackinac, was a patrol boat that served in the United States Revenue Cutter Service from 1903 to 1915 and in the United States Coast Guard from 1915 to 1917 and from 1919 to 1939. Upon commissioning, Mackinac was assigned to duty on the Great Lakes as a boarding boat at Erie, Pennsylvania. She left the Great Lakes briefly in the spring of 1905 for service along the Massachusetts coast, but on 25 April 1905 she was ordered to return to the Great Lakes, specifically to proceed to Sault Ste. Marie, Michigan, for "customs duty, and enforce the rules and regulations governing the movement and anchorages of vessels in the St. Mary's River."[1] She arrived at Sault Ste. Marie on 28 June 1905. When the Great Lakes iced over for the winter, she was placed out of service at Milwaukee, Wisconsin, on 1 December 1905 to await the opening of navigation in the spring of 1906.

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