A system, comprising: a first instrument having a first plurality of electrodes, the first instrument configured to be placed inside a chamber of a heart; a second instrument having a second plurality of electrodes, the second instrument configured to be placed in or on a patient's body such that the second instrument does not move with respect to the heart; the system being characterised by a control unit configured to: receive first far-field electrogram information from the second instrument, identify a unique pattern associated with atrial fibrillation in the first far-field electrogram information, once the unique pattern in the first far-field electrogram information is identified, receive first near-field electrogram information from the first instrument, receive first position coordinates of the first instrument associated with the first near-field electrogram information, store information associated with the unique pattern, the first position coordinates of the first instrument, and the first near-field electrogram information, receive second far-field electrogram information from the second instrument, after the first instrument has moved from the first position coordinates, identify the unique pattern in the second far-field electrogram information, once the unique pattern in the second far-field electrogram information is identified, receive second near-field electrogram information from the first instrument, receive second position coordinate of the first instrument associated with the second near-field electrogram information, store the second position coordinates of the first instrument and the second near-field electrogram information, and generate a conduction vector map for a phase of the heart associated with the unique pattern, the conduction vector map generated based on the first near-field electrogram information and the second near-field electrogram information. a first instrument having a first plurality of electrodes, the first instrument configured to be placed inside a chamber of a heart; a second instrument having a second plurality of electrodes, the second instrument configured to be placed in or on a patient's body such that the second instrument does not move with respect to the heart; the system being characterised by a control unit configured to: receive first far-field electrogram information from the second instrument, identify a unique pattern associated with atrial fibrillation in the first far-field electrogram information, once the unique pattern in the first far-field electrogram information is identified, receive first near-field electrogram information from the first instrument, receive first position coordinates of the first instrument associated with the first near-field electrogram information, store information associated with the unique pattern, the first position coordinates of the first instrument, and the first near-field electrogram information, receive second far-field electrogram information from the second instrument, after the first instrument has moved from the first position coordinates, identify the unique pattern in the second far-field electrogram information, once the unique pattern in the second far-field electrogram information is identified, receive second near-field electrogram information from the first instrument, receive second position coordinate of the first instrument associated with the second near-field electrogram information, store the second position coordinates of the first instrument and the second near-field electrogram information, and generate a conduction vector map for a phase of the heart associated with the unique pattern, the conduction vector map generated based on the first near-field electrogram information and the second near-field electrogram information. receive first far-field electrogram information from the second instrument, identify a unique pattern associated with atrial fibrillation in the first far-field electrogram information, once the unique pattern in the first far-field electrogram information is identified, receive first near-field electrogram information from the first instrument, receive first position coordinates of the first instrument associated with the first near-field electrogram information, store information associated with the unique pattern, the first position coordinates of the first instrument, and the first near-field electrogram information, receive second far-field electrogram information from the second instrument, after the first instrument has moved from the first position coordinates, identify the unique pattern in the second far-field electrogram information, once the unique pattern in the second far-field electrogram information is identified, receive second near-field electrogram information from the first instrument, receive second position coordinate of the first instrument associated with the second near-field electrogram information, store the second position coordinates of the first instrument and the second near-field electrogram information, and generate a conduction vector map for a phase of the heart associated with the unique pattern, the conduction vector map generated based on the first near-field electrogram information and the second near-field electrogram information.