  We present results of a high resolution survey of OH masers in Galactic Star
Forming Regions in order to study the maser emission and establish a list of
suitable candidates for higher resolution instruments follow up. We used the
Very Long Baseline Array (VLBA) to observe the 1665, 1667, 1612 and 1720 MHz OH
maser transitions within 41 regions. These are the first high resolution
observations for most of the sources. For all the transitions 30 sites of maser
emission were detected, 4 of the sources have new detections, and approximately
40% of the sources in the sample exhibit highly compact structure. Finally we
consider that the spectrum observed in W75N shows the early stage of a long
period OH maser flare in the 1665 MHz line, the first of its kind.
