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THOMPSON'S COAST PILOT. 57 Griffith Island light, on Griffith Island, 15 miles from Cape Rich, and 7 miles from Cape Croaker. Christian Island light, on Christian Island, south end, and a leading mark for Penetanguishene from Collingwood. Nottawasaga Island light, fixed, visible 10 miles, on Nottawa- saga Island, 3 miles from the elevator at Collingwood, and is the leading mark for this harbor. -TO ENTER COLLINGWOOD HARBOR--DAY OR NIGHT. Run within 1,000 feet of the Lighthouse on Nottawasaga Island, to the northward and eastward of it, in 84 fathoms water; thence for the red light on the east end of the breakwater 24 miles. Run within 50 or 100 feet of the east end of the break- water; thence due south, until the red light on the elevator opens up; thence for the dock in range. Vessels drawing over 10 feet should not go south of this range. In going in, leave the red buoys to starboard and black to port. Fisherman's shoal bears from the east end of the breakwater NNE, distant 120 chains, with 14 to 17 feet water on it, Nottawasaga Island Lighthouse bears from the east end of the breakwater NW4N 24 miles. i VARIATION OF THE COMPASS ON LAKE HURON AND THE STRAITS OF MACKINAW. o. 7 oO Ff Forty-Mile Point, . 1 53 E. | Bois Blanc Lighthouse, I 31 E. Mackinaw, . . ...219 E. | Point Waugoshance, 2 13 KH. Skillegole, . . . 245 EH. | BeaverIsland, . , 3 12 HK, Seul Choix Point, . 8 56 E. | South Manitou Island, 4 00 E. Detour Passage,. . 1 23 W.| Fort Gratiot, ,». , 3 56 E.