An apparatus and methods, operable with a medical navigation system, for calibrating a medical tool having a tip, involving a body configured to accommodate a plurality of tool dimensions and having a plurality of cooperating spring-loaded cams for accommodating a plurality of tool cross-sectional dimensions, a frame couple-able with the body and having at least one frame tracking marker coupled therewith, and a reference point feature coupled with the body, the reference point feature providing a known spatial reference point relative to the at least one frame tracking marker.
