St. Ignace — The U.S. Coast Guard has rescued a 65-year-old woman whose sailboat ran aground during a solo sailing challenge from Chicago to Mackinac Island.

The woman used a marine radio to call for help early Tuesday from the Straits of Mackinac between Michigan's Upper and Lower Peninsulas. The Coast Guard says she was airlifted from near the 35-foot sailboat after two unsuccessful rescue attempts.

She was taken to a hospital for evaluation, but was protected by cold water gear and a life jacket.

The boat ran aground near Round Island. A Coast Guard crew arrived by boat, but couldn't get close enough due to waves and shallow water. A Coast Guard helicopter tried to reach her but had mechanical problems. Another helicopter rescued her.

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