TOBERMORY, Ont. -- Police say following the instructions from a GPS on a foggy night left an Ontario woman taking an unplanned swim in Lake Huron.

Ontario Provincial Police say the 23-year-old woman from Kitchener, Ont., was following a route on her car's GPS while driving in the dark on Thursday night in Tobermory, Ont.

They say she made a turn that took her straight into Little Tub Harbour on the shores of Lake Huron, where her car sank about 30 metres from shore.

Police say the woman was able to roll down the window and swim to safety in frigid water temperatures of 4 C.

They say she did not suffer any injuries.

OPP say they were able to tow the car out of the water early Friday morning.