#$%^&*AU2009220029B220141106.pdf#####-59ABSTRACT A method includes positioning body-electrodes in galvanic contact with a body of a patient and positioning a mapping-tool, having a mapping-electrode, in a 5 plurality of regions in the body. The method further includes tracking the mappingtool at different positions in each of the regions using a location-measuring system, and for each region, generating a respective set of calibration-currents between the body-electrodes and the mapping-electrode at the different positions in the region. A respective relation is derived for each region between the respective set of the 10 calibration-currents and the different positions, and is used in determining the location of an investigation-tool in response to the different respective relations and investigation-tool-currents. 15 25/09/09,va 18256 speci.doc,59
