  Here we present Australia Telescope Compact Array HI maps of 16 HI sources in
six Group Evolution Multiwavelength Study (GEMS) groups that were previously
observed with the Parkes telescope. The higher spatial resolution of the ATCA
allows us to clearly identify the optical counterparts for the first time --
most being associated with low surface brightness late-type galaxies. New
integrated HI maps and velocity fields for each source are presented. We find
several interacting systems; one of which contains three galaxies within a
common HI envelope. Extended HI structures in the sample are more consistent
with tidal effects than ram pressure stripping. We identify two HI detections
with previously uncatalogued optical galaxies, and add a total of six newly
identified group members to the NGC 3923, 5044 and 7144 groups.
