A method to display augmented reality, comprising: determining at least a position and orientation of a head-mounted component of an AR display system relative to a global coordinate system, the head-mounted component of the AR display system being movable relative to the global coordinate system; emitting, through an electromagnetic field emitter (402, 602), a known magnetic field, wherein the electromagnetic field emitter (402, 602) is housed in a hand-held component of the AR display system, the hand-held component of the AR display system being movable relative to the head-mounted component of the AR display system and the global coordinate system; measuring, through an electromagnetic sensor (404, 604), a parameter related to a magnetic flux at the electromagnetic sensor (404, 604) as a result of the emitted known magnetic field, wherein the electromagnetic sensor (404, 604) is coupled to the head-mounted component of the AR display system, wherein the electromagnetic sensor (404, 604) comprises a hollow ferrite cube (1206, 1208), the hollow ferrite cube (1206, 1208) increasing electromagnetic field sensitivity and reducing a weight of the hollow ferrite cube compared with a solid ferrite cube, wherein world coordinates of the electromagnetic sensor (404, 604) relative to the global coordinate system are known based at least in part on SLAM analysis, and wherein the electromagnetic sensor (404, 604) comprises at least three coils (148, 150, 152) housed at different locations in the head-mounted component of the AR display system; determining at least a position and orientation of the hand-held component of the AR display system relative to the global coordinate system based at least in part on the determined position and orientation of the head-mounted component of the AR display system and the measured parameter related to the magnetic flux at the electromagnetic sensor (404, 604); and displaying virtual content through a display to a user based at least in part on the determined position and orientation of the hand-held component of the AR display system relative to the global coordinate system, wherein the display is housed in the head-mounted component of the AR display system. determining at least a position and orientation of a head-mounted component of an AR display system relative to a global coordinate system, the head-mounted component of the AR display system being movable relative to the global coordinate system; emitting, through an electromagnetic field emitter (402, 602), a known magnetic field, wherein the electromagnetic field emitter (402, 602) is housed in a hand-held component of the AR display system, the hand-held component of the AR display system being movable relative to the head-mounted component of the AR display system and the global coordinate system; measuring, through an electromagnetic sensor (404, 604), a parameter related to a magnetic flux at the electromagnetic sensor (404, 604) as a result of the emitted known magnetic field, wherein the electromagnetic sensor (404, 604) is coupled to the head-mounted component of the AR display system, wherein the electromagnetic sensor (404, 604) comprises a hollow ferrite cube (1206, 1208), the hollow ferrite cube (1206, 1208) increasing electromagnetic field sensitivity and reducing a weight of the hollow ferrite cube compared with a solid ferrite cube, wherein world coordinates of the electromagnetic sensor (404, 604) relative to the global coordinate system are known based at least in part on SLAM analysis, and wherein the electromagnetic sensor (404, 604) comprises at least three coils (148, 150, 152) housed at different locations in the head-mounted component of the AR display system; determining at least a position and orientation of the hand-held component of the AR display system relative to the global coordinate system based at least in part on the determined position and orientation of the head-mounted component of the AR display system and the measured parameter related to the magnetic flux at the electromagnetic sensor (404, 604); and displaying virtual content through a display to a user based at least in part on the determined position and orientation of the hand-held component of the AR display system relative to the global coordinate system, wherein the display is housed in the head-mounted component of the AR display system.