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THOMPSON'S COAST PILOT. 83 from 3 to 3} 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 alongside of the dock. : Spectacle Reef bears from Bois Blane Lighthouse EbyS 133 miles, and due east from the Beacon on the SE point of the same 9 miles. It bears from Sheboygan. Lighthouse NEbyEE 15 miles, and from Detour Lighthouse SW43S 172 miles. St. Martins's Reef bears from Bois Blanc Lighthouse NEbyE} E 154 miles, and from Detour Lighthouse WbySiS 114. miles. There is a patch with 13 feet water on it 83 miles W2N from Spec- tacle Reef, and from Bois Blanc Lighthouse EbyS48 94 miles. There is also a shoal with 6 to 9 feet water on it NNWiW 62 miles from Bois Blanc Lighthouse, SWbyW4W 8 miles from Goose Island, and 7 miles from Mackinaw Harbor on the same range. The reef off Goose Island sets off SSEZE 1 mile; rocky, wey 1, 2, 3, 4 and 9 feet of water on it. Tobin's Reef lies NWbyW 38 miles from St. Martin's Reef, - and has from 6 to 9 feet of water on it. St. Martin's Reef has from 7 to 11 feet of water on it. Vessels bound to Mackinaw will find plenty of water, with a 5 to 6 mile channel, clear of these reefs. ~The coast from Detour to Point St. Martin is very rocky, with indentations, points and islands, forming several good harbors. Scammon Harbor is one of the best, with 5 to 6 fathoms water going in. Root Island, at the entrance on the starboard hand, bears from Bois Blanc Lighthouse NEbyN 12 miles, Marquette Bay is also a good harbor. The entrance bears from Goose Island NbyW4W 23 miles. To run into the bay, keep the - starboard side close aboard, in 5 to 6 fathoms, haul up to the east- ward, and come to in 4 to oF fathoms water, mud bottom. The entrance is |. mile wide, with nothing less than 6 fathoms water, except off Point Brulee on the port side. The shoal off this point has 11 feet of water on it, and drops off suddenly. There is a patch of rock with 17 feet of water on it between the NW end of Round Island and old Mackinaw, bearing from old Mackinaw NEbyHEH, and from the centre of Round Island 3} tailes WbyS28. 2