I never seen that post about the Chi Cheemaun earlier, I got a good laugh, being that it is the disboards. I will answer this question because I live on the Island the Chi Cheemaun ferries to.
It is a large fairy boat on the great lakes. Travelling from Tobermory on the Bruce Penninsula to Manitoulin Island (South Baymouth) In the winter the only way on and off Manitoulin Island is via a swing bridge, in Little Current. In the summer we also have the ferry to join people from the South, to the Island. It is about a 1.5 to 2 hour sailing time, and yes your cars go on as well. Also in the summer, for 15 mins, every hour, the swing bridge swings open ( hence the name, swing bridge)to allow for boats to pass in the North Channel. It is a narrow opening when it is open, and people must wait in the channel till it opens to go through in the port of Little Current! Look up Manitoulin Island or Google, it is a very beautiful natural place to visit, you won't be disappointed!