Changes

'''A 5DOF (five-degree-of-freedom) electromagnetic tracker''' tracks a single [[dipole coil receiver]] against a spread-out array of [[transmitter coil]]s. The single coil is symmetrical about its axis, so orientation roll about the single coil's axis cannot be tracked. Orientation latitude and longitude can be tracked, and X,Y,Z position.

'''A 5DOF (five-degree-of-freedom) electromagnetic tracker''' is a type of [[electromagnetic tracking system]] that tracks a single [[dipole coil receiver]] against a spread-out array of [[transmitter coil]]s. The single coil is symmetrical about its axis, so orientation roll about the single coil's axis cannot be tracked. Orientation latitude and longitude can be tracked, and X,Y,Z position.

The single receiver coil does not need to be characterized, as long as the coil is small enough to be a dipole, as the coil's gain is tracked as part of the position-and-orientation algorithm.

The single receiver coil does not need to be characterized, as long as the coil is small enough to be a dipole, as the coil's gain is tracked as part of the position-and-orientation algorithm.

The single coil can be used as a transmitter, and the array as receivers, though it can be difficult to get enough signal.

The single coil can be used as a transmitter, and the array as receivers, though it can be difficult to get enough signal.

==Options==

==Architectures==

There are many choices for the spread-out array:

There are many choices for the spread-out array: