... Additionally a fundamental change has been made in the philosophy used to handle image distortions and astrometry. In the past, MultiDrizzle used a set of coefficients separate from the image world coordinate system (WCS) to define nonlinear distortions in the image, and even some small linear corrections in certain cases. ... For instance, we plan to distribute code that will compare a catalog of object positions derived from an HST image with an astrometric catalog supplied by the user. ...