  We report on the results of a 14 year long VLBI study of proper motions in
the IC133 H2O maser source in the galaxy M33. The method of Ordered Motion
Parallax was used to model the 3-dimensional structure and dynamics of IC133
and obtain a distance estimate, 800 +/- 180 kpc. Our technique for determining
the distance to M33 is independent of calibrations common to other distance
indicators, such as Cepheid Period-Luminosity relations, and therefore provides
an important check for previous distance determinations.
