16-Aug-2007 -- While conducting business in the Rhindland, Wisconsin area I noticed a sign along the road noting a geographic monument 4-miles north of the road. Upon my return to the airport I decided to visit the location. I was surprised to learn that I was near N45 W90. Another surprised was to notice that my GPS and the brass plate did not agree with each other. My GPS said that N45 W90 was still 0.2 mile away. So I took the time to walk in a bean field to find the spot.