A method for location tracking, includes measuring oneor more first impedance-magnitudes, between a probe locatedat a location in an organ of a patient and one or morebody-surface electrodes, at a first electrical frequency.One or more second impedance-magnitudes, between the probelocated at the location and the one or more body-surfaceelectrodes, are measured at a second electrical frequency.Based on the measured first and second impedance-magnitudes, one or more probe zero-frequencyimpedance-magnitudes between the probe and the one or morebody-surface electrodes are estimated. The location of the probein the organ is estimated based on the one or more probezero-frequency impedance-magnitudes.
