Detecting and compensating for magnetic interference in electromagnetic (em) positional tracking

A system, comprising:

• an electromagnetic (EM) tracking transmitter;
• an EM tracking receiver;
• and
• a processor based apparatus in communication with the EM tracking transmitter and the EM tracking receiver;
• wherein the processor based apparatus is configured to execute steps comprising:
• using the EM tracking transmitter and the EM tracking receiver to implement an EM tracking system;
• using the EM tracking system to track a tangible object;
• detecting a presence of interference with a magnetic field generated by the EM tracking system;
• and
• compensating for the interference.

A non-transitory computer readable storage medium storing one or more computer programs configured to cause a processor based system to execute steps comprising:

• using an electromagnetic (EM) tracking system to track a tangible object;
• detecting a presence of interference with a magnetic field generated by the EM tracking system;
• and
• compensating for the interference.