Tracking system and marker device to be tracked by the tracking system

A tracking system for use in surgery, the tracking system comprising:

• a field generator for generating a predetermined magnetic or electromagnetic excitation field for inducing mechanical oscillations of a magnetic object of a sensing unit of a marker device, wherein the magnetic object provides a permanent magnetic moment, wherein the sensing unit is configured to transduce the predetermined magnetic or electromagnetic excitation field into induced mechanical oscillations of the magnetic object, wherein the induced mechanical oscillations of the magnetic object generate a magnetic or electromagnetic response field;
• a transducer for transducing the magnetic or electromagnetic response field generated by the induced mechanical oscillations of the magnetic object into one or more electrical response signals, and
• a position determination unit for determining the position of the marker device on the basis of the one or more electrical response signals.