This is about halfway between Chicago and Winthrop, IL (North Point Marina).
You may see how much smog there is over Chicago, part of that was caused by hundreds of boats and the air show.
42°12'07.0"N 87°37'31.5"W
The trip took from about 1:30 PM until 8 PM, and the average speed was about 5.8 knots.
The water was almost flat all the way.