  The XMM-OM instrument extends the spectral coverage of the XMM-Newton
observatory into the ultraviolet and optical range. It provides imaging and
time-resolved data on targets simultaneously with observations in the EPIC and
RGS. It also has the ability to track stars in its field of view, thus
providing an improved post-facto aspect solution for the spacecraft. An
overview of the XMM-OM and its operation is given, together with current
information on the performance of the instrument.
