Abstract: The present disclosure provides systems and methods for generating a local activation time (LAT) map. A method includes receiving at least one reference electrogram, receiving at least one roving electrogram, detecting cardiac activations in the at least one reference electrogram, detecting roving cardiac activations in the at least one roving electrogram, identifying, at a trigger time, a most recent reference cardiac activation of the detected reference cardiac activations, identifying, a corresponding roving cardiac activation of the detected roving cardiac activations that is closest in time to the most recent reference cardiac activation, the corresponding roving cardiac activation identified independent of any roving activation interval (RAI), computing, a LAT as a time difference between the most recent reference cardiac activation and the corresponding roving cardiac activation, and generating and displaying, a LAT map based on the computed LAT.