by Fred J. Calfior and Douglas W. Miller
Chicago Low Altitude Enroute Chart L-23
These charts are obsolete and are not for real-world navigation.
The Low Altitude Enroute Chart, for the Chicago flight scenario, is on the following page. The map scale is 1" = 12 NM. Study the chart, there is a wealth of information on it. The area that this section of the chart covers is illustrated in Figure B.3.