In one embodiment a medical tracking system, including a catheter to be inserted into blood vessels of a body-part of a living subject, and including a flexible shaft having a deflectable distal end, and a location tracking transducer in the distal end configured to output a signal indicative of a location of the transducer, a tracking subsystem to track locations of the distal end over time responsively to the signal, a display, and processing circuitry to add the tracked locations of the distal end to a movement log, and render to the display an image of at least part of the body-part with a representation of a length of the shaft of the catheter in at least one blood vessel of the body-part, with respective positions along the length of the shaft being located in the image responsively to respective ones of the tracked locations from the movement log.