Technical Abstract: Precision agriculture, environmental applications, and land use planning needs have led to calls for more detailed soil maps. A remote sensing technique that can differentiate soils with a high degree of accuracy would be ideal for soil survey purposes. One technique that has shown promise in Iowa is electrical conductivity (ECa) measured by the Geonics® EM-38. Electrical conductivity readings obtained with this technique result from a combination of the soils’ water content, clay content, soluble salt content, and temperature. One way ECa techniques have been evaluated as soil survey tools involves grid mapping a field, doing an ECa survey of that field, and comparing the maps obtained using each method. Good results have been obtained in this way for several fields in central Iowa that contain soils that are fairly variable over relatively short distances. A field with lacustrine-derived soils that exhibit only slight variations in soil properties across the field was chosen for this study. This led to highly uniform ECa readings and an inability to differentiate between soil map units using the ECa data. However, this was also valuable information as it confirmed the uniform nature of the soils in the field, a critical criterion for a precision agriculture study being conducted in that field.