A system includes a display device configured to present an epicardial vascular map. The system also includes a processing unit configured to: receive electrical signals obtained from a vascular mapping catheter and/or a magnetically tracked catheter； determine, from the electrical signals, a plurality of impedance measurements associated with one or more electrodes of the vascular mapping catheter； access a field map, the field map having expected impedance measurements determined based on determined positions of the one or more additional electrodes of the magnetically tracked catheter； determine, based on the plurality of impedance measurements and the field map, positions of the electrodes of the vascular mapping catheter； generate, based on the positions, the epicardial vascular structure； access the epicardial cardiac map； annotate the epicardial cardiac map with the representation of the epicardial vascular structure to generate the epicardial vascular map； and facilitate display of the epicardial vascular map.
