Potent is a Windows application that provides a highly interactive framework for 3-D modelling of magnetic and gravity data. This example uses one of Geosoft's Oasis montaj sample datasets. The top left window shows the entire TMI dataset as a grid. The bottom left window shows the subset of data around the two anomalies of interest. The top right window shows an ENE section across this region. The anomalies have been modelled as a dyke and a flat tabular structure. The blue crosses are the observed TMI field, and the red line is the calculated field due to the model. The bottom right window shows the calculated field due to the model as an image at the same colour stretch as the observed field. Potent works in 3-D space. Observation points can have height and ground clearance associated with them. The bodies that constitute the model are all able to be translated and rotated in three dimensions. The field due to the model is calculated at the true position of the observations, thereby incorporating elevation effects such as those due to topography or aircraft height.