MediGuide Navigation Systems Now Part of St. Jude Medical MediGuide has developed a sophisticated navigation system, the Medical Positioning System (gMPS(TM)), that uses proprietary technology for real-time tracking of sub-millimeter sized sensors. These sensors can be mounted on needles, guidewires, catheters, or other medical devices used for minimally-invasive intra-body navigation. The 3-D position and orientation of the sensors can be calculated in real time and projected graphically on a fluoroscope, CT, MRI, ultrasound, or 3-D reconstructed image of the anatomy.