A system of mapping premature ventricular contraction ("PVC") activity using an electroanatomical mapping system, comprising a processor for: establishing a plurality of PVC maps, each PVC map of the plurality of PVC maps comprising a plurality of electrophysiology data points and an associated PVC template signal, wherein each electrophysiology data point in turn includes both electrophysiology data and location data, collecting an electrophysiology data point including an electrophysiological signal; sequentially comparing (308, 312) the electrophysiological signal to each PVC template signal of the plurality of PVC maps, wherein the sequence in which the electrophysiological signal is sequentially compared to PVC template signals associated with the plurality of PVC maps occurs corresponds to a diminishing number of electrophysiology data points in the plurality of PVC maps such that it is first compared to the PVC template signal associated with the PVC map having the most electrophysiology data points, next to the PVC template signal associated with the PVC map having the second most electrophysiology data points and so on until it is finally compared with the PVC template signal associated with the PVC map having the fewest electrophysiology data points, until a first to occur of: a morphological similarity between the electrophysiological signal and the PVC template signal exceeds a preset threshold; or the electrophysiological signal has been compared to each PVC template signal of each PVC map without the morphological similarity between the electrophysiological signal and the PVC template signal exceeding the preset threshold; and if the first to occur is the morphological similarity between the electrophysiological signal and the PVC template signal exceeds the preset threshold: adding (310, 314) the electrophysiology data point to the PVC map associated with the PVC template signal. establishing a plurality of PVC maps, each PVC map of the plurality of PVC maps comprising a plurality of electrophysiology data points and an associated PVC template signal, wherein each electrophysiology data point in turn includes both electrophysiology data and location data, collecting an electrophysiology data point including an electrophysiological signal; sequentially comparing (308, 312) the electrophysiological signal to each PVC template signal of the plurality of PVC maps, wherein the sequence in which the electrophysiological signal is sequentially compared to PVC template signals associated with the plurality of PVC maps occurs corresponds to a diminishing number of electrophysiology data points in the plurality of PVC maps such that it is first compared to the PVC template signal associated with the PVC map having the most electrophysiology data points, next to the PVC template signal associated with the PVC map having the second most electrophysiology data points and so on until it is finally compared with the PVC template signal associated with the PVC map having the fewest electrophysiology data points, until a first to occur of: a morphological similarity between the electrophysiological signal and the PVC template signal exceeds a preset threshold; or the electrophysiological signal has been compared to each PVC template signal of each PVC map without the morphological similarity between the electrophysiological signal and the PVC template signal exceeding the preset threshold; and a morphological similarity between the electrophysiological signal and the PVC template signal exceeds a preset threshold; or the electrophysiological signal has been compared to each PVC template signal of each PVC map without the morphological similarity between the electrophysiological signal and the PVC template signal exceeding the preset threshold; and if the first to occur is the morphological similarity between the electrophysiological signal and the PVC template signal exceeds the preset threshold: adding (310, 314) the electrophysiology data point to the PVC map associated with the PVC template signal.