A system and method for maintaining certain content items at a fixed size and resolution andor position relative to a device display are described herein. Each of the plurality of cavities contains a single one of the plurality of light emitters. The table is moved through a number of positions over the desired FOV and MR data are acquired over the plurality of table positions. It is found to be advantageous for the stability of the vehicle on the track if responsivity of the secondary feedback loop is set to be equal to the reciprocal of the responsivity of the steering servo.