A redundant power distribution system and method of operation for transferring electrical power from one of several power sources to a load are disclosed. By doing so, the density of various key values may be determined and compared, and a bit map may be generated over the range of rows of the key value that is denser, resulting in a reduction of resources to build and use the bit map. The first fiducial device operates to make one fiducial on the substrate during the movement along the trajectory and the relative motion.