The theoretical case of a polarized hidden sphere is discussed briefly. To determine location, depth and dip of an orebody displaying natural currents a method of practical value is explained and a master diagram is given. A distinction is made between anomalies which can be treated assuming a polarized sphere and those which can not be interpreted this way. A generalized method of topographical and regional correction is given. The procedure of interpretation and topographical correction is shown with two field examples. The method is not empirical and the results are precise when applied to the cases in which the assumption of a sphere is justified. It is shown that topographical corrections can not be overlooked.