An electromagnetic navigation system having a wireless, battery-poweredmedical tool is provided. The system charges the medical tool using energyfromthe same magnetic fields used to locate the tool in 3-D space. The systemincludesone or more wireless transmission devices which generate the magnetic fields.Themedical tool includes a receiving coil which generates electrical signalsindicativeof a location of the tool in response to receiving the magnetic fields. Thetool alsoincludes a wireless interface which provides electrical signals for processingtodetermine the location of the tool in 3-D space and a battery which suppliespowerto the tool. The tool also includes one or more charging coils, electricallyconnectedto the battery. Each charging coil receives energy from the magnetic fieldspassingthrough a charging coil surface and supplies the energy to the battery tochargethe battery.
