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46 THOMPSON'S COAST PILOT. thence NNW 77% miles to abreast of Thunder Bay Island Lighthouse, bearing WSW 5 miles; thence NWbyN 75 miles to the mouth of Detour passage; bring Detour light to bear west, 1 mile distant. After running NWbyN from Thunder Bay Island Lighthouse for 27 miles, Presqwile light should bear SWhbyW, distant 5 miles. | FROM FORT GRATIOT LIGHTHOUSE TO MACKINAW, 241 MILES. The same as above to Presqwile, 178 miles; thence NWbyW +W 60 miles, to a point 4 a mile north of Bois Blane Island Lighthouse; thence WiN 93 miles, to Mackinaw Harbor. FROM PRESQU'ILE TO THE DOCK AT DUNCAN CITY OR SHEBOYGAN BAY, FIFTY-NINE AND ONE-HALF MILES. From Presqwile NWbyWW 50 miles; thence west 8 miles, passing ¢ of a mile north of Sheboygan Lighthouse, and 1 mile to the westward of the same; thence south 14 miles, to the dock at Duncan; and note, that in rounding the Lighthouse point you will carry from 3 to 32 fathoms water close to, until you range the south side of the dock, when you will suddenly drop into 5 fathoms, where you can let go an anchor or run along- side of the dock. Spectacle Reef bears from Bois Blanc Lighthouse EbyS 132 miles, and due east from the Beacon on the SE point of the same 9 miles. It bears from Sheboygan Lighthouse NEbyE2E 15 miles, and from Detour Lighthouse SW48 172 miles. St. Martin's Reet bears from Bois Blanc Lighthouse NEbyE} E 154 miles, and from Detour Lighthouse WbyS#S 113 miles. There is a patch with 13 feet water on it 32 miles W2N from Spectacle Reef, and from Bois Blane Lighthouse EbyS38 9 miles. There is also a shoal with 6 to 9 feet water on it NNW W 62 miles from Bois Blane Lighthouse, SWbyW4W 8 miles from Goose Island, and 7 miles from Mackinaw Harbor on the same range. The reef off Goose Island sets off SSELE 1 mile ; rocky, with 1, 2, 3, 4 and 9 feet water on it. Tobin's Reet lies NWbyW 3 miles from St. Martin's Reef, and has from 6 to 9 feet of water on it. St. Martin's Reef has trom 7 to 11 feet of water on it.