1. A system for identifying a landmark, the system comprising: a field generator for generating a magnetic field; an orthopedic implant located within the magnetic field, the orthopedic implant having at least one landmark and a longitudinal groove with a proximal end portion and a distal end portion; a first magnetic sensor mounted to the orthopedic implant at the distal end portion of the longitudinal groove and spaced apart from the at least one landmark a set distance; a landmark identifier; and a processor for comparing sensor data from the first sensor that landmark identifier and using the set distance to calculate the position of the landmark identifier relative to the at least one landmark.