We use simulations to demonstrate the feasibility of a novel approach to motion tracking, which is based on using a 16-probe field camera to monitor the fields generated by briefly passing currents through small coils affixed to the head. Using previously recorded head motion data we show that changes in head position can be accurately estimated from the measured field changes. The benefits of this approach are that problematic line-of-sight access to markers is not required (cf. optical approaches) and that it could be implemented without modification of the MRI sequence (cf. navigators).