A system, comprising; a magnetic position tracking system; a Magnetic Resonance Imaging system; an interface, which is configured to communicate with the MRI system and with the magnetic position tracking system; and wherein the system is configured to: acquire from the MRI system a three-dimensional MRI image of an organ of a patient; acquire from the magnetic position tracking system a 3D magnetic position tracking map of the organ of the patient; and then perform registration to create an overlaid image between the 3D MRI image and the 3D magnetic position tracking map; wherein the system further comprises a processor, which is configured to: display a position of a distal end of a medical probe that is being navigated in an organ of a patient on the 3D magnetic position tracking map of the organ; in response to an event, select a plane of interest comprising the distal end and to acquire from the MRI system, via the interface, a real-time MRI slice of the organ at the selected plane; and then perform registration between the MRI slice and the 3D magnetic position tracking map and display the MRI slice overlaid on the 3D magnetic position tracking map. a magnetic position tracking system; a Magnetic Resonance Imaging system; an interface, which is configured to communicate with the MRI system and with the magnetic position tracking system; and wherein the system is configured to: acquire from the MRI system a three-dimensional MRI image of an organ of a patient; acquire from the magnetic position tracking system a 3D magnetic position tracking map of the organ of the patient; and then perform registration to create an overlaid image between the 3D MRI image and the 3D magnetic position tracking map; wherein the system further comprises acquire from the MRI system a three-dimensional MRI image of an organ of a patient; acquire from the magnetic position tracking system a 3D magnetic position tracking map of the organ of the patient; and then perform registration to create an overlaid image between the 3D MRI image and the 3D magnetic position tracking map; wherein the system further comprises a processor, which is configured to: display a position of a distal end of a medical probe that is being navigated in an organ of a patient on the 3D magnetic position tracking map of the organ; in response to an event, select a plane of interest comprising the distal end and to acquire from the MRI system, via the interface, a real-time MRI slice of the organ at the selected plane; and then perform registration between the MRI slice and the 3D magnetic position tracking map and display the MRI slice overlaid on the 3D magnetic position tracking map. display a position of a distal end of a medical probe that is being navigated in an organ of a patient on the 3D magnetic position tracking map of the organ; in response to an event, select a plane of interest comprising the distal end and to acquire from the MRI system, via the interface, a real-time MRI slice of the organ at the selected plane; and then perform registration between the MRI slice and the 3D magnetic position tracking map and display the MRI slice overlaid on the 3D magnetic position tracking map.