A system , comprising: an interface configured to receive intracardiac electrogram (IEGM) signals measured at a plurality of locations in a region of a heart that contains a His bundle of the heart; and a processor , which is configured to: process the IEGM signals to find respective local activation time (LAT) values at the plurality of the locations; identify a cluster of the locations at which peaks in the IEGM signals, associated with the LAT values, occur later than a defined time; for the locations in the identified cluster, calculate respective time differences between times of occurrence of the identified peaks and a reference time; compare the time differences to a threshold value and retain the locations for which the time differences are below the threshold value; filter the IEGM signals measured at the retained locations to identify respective high-frequency peaks in the IEGM signals; cross corelate the identified high-frequency peaks, and identify a subset of the locations whose high-frequency peaks meet a predefined cross-correlation level; tag the high-frequency peaks corresponding to the locations in the subset as His peaks; and indicate the tagged His peaks on a map of at least a portion of the heart. an interface configured to receive intracardiac electrogram (IEGM) signals measured at a plurality of locations in a region of a heart that contains a His bundle of the heart; and a processor , which is configured to: process the IEGM signals to find respective local activation time (LAT) values at the plurality of the locations; identify a cluster of the locations at which peaks in the IEGM signals, associated with the LAT values, occur later than a defined time; for the locations in the identified cluster, calculate respective time differences between times of occurrence of the identified peaks and a reference time; compare the time differences to a threshold value and retain the locations for which the time differences are below the threshold value; filter the IEGM signals measured at the retained locations to identify respective high-frequency peaks in the IEGM signals; cross corelate the identified high-frequency peaks, and identify a subset of the locations whose high-frequency peaks meet a predefined cross-correlation level; tag the high-frequency peaks corresponding to the locations in the subset as His peaks; and indicate the tagged His peaks on a map of at least a portion of the heart. process the IEGM signals to find respective local activation time (LAT) values at the plurality of the locations; identify a cluster of the locations at which peaks in the IEGM signals, associated with the LAT values, occur later than a defined time; for the locations in the identified cluster, calculate respective time differences between times of occurrence of the identified peaks and a reference time; compare the time differences to a threshold value and retain the locations for which the time differences are below the threshold value; filter the IEGM signals measured at the retained locations to identify respective high-frequency peaks in the IEGM signals; cross corelate the identified high-frequency peaks, and identify a subset of the locations whose high-frequency peaks meet a predefined cross-correlation level; tag the high-frequency peaks corresponding to the locations in the subset as His peaks; and indicate the tagged His peaks on a map of at least a portion of the heart. <EOS>