1. A medical tracking system comprising: an image-capture sub-system configured to capture images during a medical procedure; an electromagnetic tracking sub-system configured to track one or more medical instruments and one or more image-capture components of the image-capture sub-system during a medical procedure; a tracker unit conformally mounted to one of the image-capture components of the image-capture sub-system that is being tracked by the electromagnetic tracking sub-system, wherein the tracker unit is conformally mounted so that the unit conforms to a surface of the image-capture component to which the unit is mounted.