This is a simple 2 stage multi. Final is not far from the 1st stage. It is engraved with the state names on the respective sides. On one side there is a year engraved. Use the final digit of the year and subtract is from the North coordinates. Add the first and third digits of the year (first digit is a bit hard to read, but obvious what it must be) then add that sum to the West Coordinates.
This is a simple 2 stage multi. Final is not far from the 1st stage. The Chicago Road originally followed the basic path of the Old Sauk Indian Trail from Michigan to Wisconsin. Later when US 12 was built, it roughly paralleled this route. At the coordinates you will find an old road marker. (Very durable, but less forgiving in slippery weather.) This interesting rock sits straddle the Indiana – Michigan State boundary. It is engraved with the state names on the respective sides. On one side there is a year engraved. Use the final digit of the year and subtract is from the North coordinates. Add the first and third digits of the year (first digit is a bit hard to read, but obvious what it must be) then add that sum to the West Coordinates.