A medical device is provided. The probe generates a position signal and also has an electrode at the distal end, which electrode acquires and positions an electrical signal acquired from a ventricular surface position due to a conduction wave across the surface. The processor derives the LAT from the electrical signal and calculates a first time difference between the LATs in the first pair of positions and a second time difference between the LATs in the second pair of positions. The processor calculates first and second LAT derived distances as a product of the first and second time differences with the conducted wave velocity, and the first difference in distance from the position to the first pair of positions is A arrhythmia origin at a surface position equal to the LAT derived distance of 1 and the second difference in distance from the position to the second pair of positions equals the second LAT derived distance, and Mark on the display. [Selection diagram] Figure 1
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