1. A method of detecting position on a continuous print receiving elastic web for use in a printing assembly having a moving print receiving elastic web and a plurality of spaced registration features thereon, means for printing indicia on the web, means for sensing registration features on the moving web, wherein at least some said registration features may be missing or damaged, a print positioning system defining a coarse coordinate system consisting of the positions of sensed registration features meeting size and location parameters and a fine coordinate system derived from said coarse coordinate system, said print positioning system utilizing said fine coordinate system to synchronize the actuation of said means for printing with the movement of said web, whereby said indicia are deposited in a particular location on said web, the method comprising: calculating a predicted position on the web for each registration feature from the set of registration feature positions making up the coarse coordinate system, and utilizing said predicted registration feature position to update said fine coordinate system.