catheterization in accordance with an embodiment of the present invention system 20 may be based for example on the carto u2122 system produced by biosense webster inc diamond bar calif this system comprises an invasive probe in the form of a catheter 22 and a control console 24 the catheter is typically provided to users as a disposable unit with a connector 26 typically a plug that mates with a corresponding connector 28 typically a receptacle on the console in the context of the present patent application and in the claims the term u201c connector u201d is used in the conventional sense to mean any sort of electrical plug or similar device that can be readily connected and disconnected in the field without technical operations such as soldering or crimping catheter 22 comprises an insertion tube whose distal end 30 is designed to be passed through the vascular system and into a chamber of the heart typically the distal end of the catheter comprises a functional element 32 near a distal tip 34 of the catheter for performing therapeutic and or diagnostic functions for example element 32 may comprise an electrode or an ultrasound transducer catheter 22 also contains a position sensor 36 which is used in determining position coordinates of distal end 30 in the carto system the position sensor comprises three coils which output signals in response to an externally applied magnetic field these signals are amplified by a signal processing circuit 48 in the catheter typically circuit 48 is located for convenience in a handle 38 of the catheter which also includes controls 40 for steering the catheter the amplified signals that.