A medical system for cardiac mapping and ablation, the system comprising: a medical device defining a distal end including a plurality of mapping elements and a treatment element configured to ablate a source of electrical conduction of interest, the plurality of mapping elements being configured to sense electrical activity signals within myocardial cells; and a control unit configured to identify the source of electrical conduction of interest within cardiac tissue, the control unit having a display, and being in communication with the medical device and programmed to: calculate arrhythmia morphology and directionality of the electrical conduction of interest using electrical activity signals sensed by the plurality of mapping elements at a first position within cardiac tissue; determine one or more optimal treatment sites based on the calculated arrhythmia morphology and directionality; display on the display at least one of suggested treatment sites within the cardiac tissue or a distance and direction to the source of the electrical conduction of interest that allow the user to move the treatment element closer to said source of electrical conduction of interest; and ablate the source of electrical conduction of interest by activating the treatment element once positioned in contact with the source of electrical conduction of interest. a medical device defining a distal end including a plurality of mapping elements and a treatment element configured to ablate a source of electrical conduction of interest, the plurality of mapping elements being configured to sense electrical activity signals within myocardial cells; and a control unit configured to identify the source of electrical conduction of interest within cardiac tissue, the control unit having a display, and being in communication with the medical device and programmed to: calculate arrhythmia morphology and directionality of the electrical conduction of interest using electrical activity signals sensed by the plurality of mapping elements at a first position within cardiac tissue; determine one or more optimal treatment sites based on the calculated arrhythmia morphology and directionality; display on the display at least one of suggested treatment sites within the cardiac tissue or a distance and direction to the source of the electrical conduction of interest that allow the user to move the treatment element closer to said source of electrical conduction of interest; and ablate the source of electrical conduction of interest by activating the treatment element once positioned in contact with the source of electrical conduction of interest. calculate arrhythmia morphology and directionality of the electrical conduction of interest using electrical activity signals sensed by the plurality of mapping elements at a first position within cardiac tissue; determine one or more optimal treatment sites based on the calculated arrhythmia morphology and directionality; display on the display at least one of suggested treatment sites within the cardiac tissue or a distance and direction to the source of the electrical conduction of interest that allow the user to move the treatment element closer to said source of electrical conduction of interest; and ablate the source of electrical conduction of interest by activating the treatment element once positioned in contact with the source of electrical conduction of interest.