An apparatus, comprising: an intracardiac catheter configured to be inserted into a cardiac chamber; a plurality of electrodes affixed to a distal end of the intracardiac catheter; a display; and a processor configured: to receive, from the intracardiac catheter inserted into a given cardiac chamber, first signals from at least three of the electrodes responsive to electrical activity in myocardial tissue with which the at least three of the electrodes are in contact, to receive second signals that are indicative of respective location coordinates of the at least three electrodes within the heart, to process the second signals so as to compute the respective location coordinates of the at least three electrodes and to determine a geometric center of the respective location coordinates, to generate, based on the first signals and the second signals, an electroanatomical map for an area of the myocardial tissue comprising the determined geometric center, to determine, in the map, a focus of an arrhythmia in the area of the myocardial tissue, to present, on the display, a circle, and to present, within the circle, a region of the map comprising the geometric center and the focus of the arrhythmia so that the geometric center on the map aligns with a center of the circle, wherein the region of the map presented within the circle indicates a spatial relationship between the geometric center and the focus of the arrhythmia. an intracardiac catheter configured to be inserted into a cardiac chamber; a plurality of electrodes affixed to a distal end of the intracardiac catheter; a display; and a processor configured: to receive, from the intracardiac catheter inserted into a given cardiac chamber, first signals from at least three of the electrodes responsive to electrical activity in myocardial tissue with which the at least three of the electrodes are in contact, to receive second signals that are indicative of respective location coordinates of the at least three electrodes within the heart, to process the second signals so as to compute the respective location coordinates of the at least three electrodes and to determine a geometric center of the respective location coordinates, to generate, based on the first signals and the second signals, an electroanatomical map for an area of the myocardial tissue comprising the determined geometric center, to determine, in the map, a focus of an arrhythmia in the area of the myocardial tissue, to present, on the display, a circle, and to present, within the circle, a region of the map comprising the geometric center and the focus of the arrhythmia so that the geometric center on the map aligns with a center of the circle, wherein the region of the map presented within the circle indicates a spatial relationship between the geometric center and the focus of the arrhythmia. to receive, from the intracardiac catheter inserted into a given cardiac chamber, first signals from at least three of the electrodes responsive to electrical activity in myocardial tissue with which the at least three of the electrodes are in contact, to receive second signals that are indicative of respective location coordinates of the at least three electrodes within the heart, to process the second signals so as to compute the respective location coordinates of the at least three electrodes and to determine a geometric center of the respective location coordinates, to generate, based on the first signals and the second signals, an electroanatomical map for an area of the myocardial tissue comprising the determined geometric center, to determine, in the map, a focus of an arrhythmia in the area of the myocardial tissue, to present, on the display, a circle, and to present, within the circle, a region of the map comprising the geometric center and the focus of the arrhythmia so that the geometric center on the map aligns with a center of the circle, wherein the region of the map presented within the circle indicates a spatial relationship between the geometric center and the focus of the arrhythmia.