A neu hardware has been developed to measure the trajectory of nlcrobunches along the Stanford Llnac. To be writable for the operation of the SLAC Single Pass Collider, the bunches absolute position must be kept within £100 microns of the accelerator center, and the acquisition of this measurement must be made along the machine ID a snapshot fashion. Typically, the position of three bunches will be monitored during subsequent shots; we expect a minimum charge of HP particles per bunch and a

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... spacing between bunches of 50 nano seconds. Tb* mechanics of the position detectors is described as well as the general system organization and the calibration of various components.