Check with OCC. I know that MCC offers a class in it, but does not include the exam or application fees. I am still studying, and figure it will be about a year before I am ready to take mine in Macomb county.
The 6 pack license is a Coast Guard OUPV (Operator of Uninspected Passenger Vehicle) license which allows you to carry 6 or fewer passengers for hire. It's good for vessels up to 100 gross tons. Check http://www.glctraining.com/ for classes and testing in Harrison Twp, I believe they are on South River Rd.
I tell you what.........I would rather be out at Gull right now with a case of Labatt Blue Light, a bunch of friends, and a bonfire watching the ships cruise down the channel. (In 80 degree weather of course). Sound Good?