The chart illustrates the regulated navigation area (green) that is closed to all marine traffic. The black line depicts an active path that Coast Guard ice breakers transit to Coast Guard Station St. Ignace. The red line depicts an active shipping lane. The blue line depicts the approximate position of a route historically used as a tree lined snowmobile trail. Transiting the ice near shipping lanes or Coast Guard transit lanes is dangerous. (U.S. Coast Guard graphic).
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