  We present a new sub-mm Super-map in the HDF-North region (GOODS-North
field), containing 40 statistically robust sources at 850 microns. This map
contains additional data, and several new sources, including one of the
brightest blank-sky extragalactic sub-mm sources ever detected. We have used
the ACS HST images and ground-based near-IR observations from GOODS to develop
a systematic approach for counterpart identification. 72 per cent of our
sources with optical coverage have a unique optical counterpart using our new
techniques for counterpart identification, and an additional 18 per cent have
more than one possibility that meet our criteria in the ACS images. We have
found a much higher ERO rate than other sub-mm surveys, due to the increased
depth in the optical images. The median photometric redshift (and quartile
range), from optical and near-infrared data, is 1.7 (1.3-2.5) for the
radio-detected sub-mm sources, and rises to 2.3 (1.3-2.7) for the
radio-undetected sub-sample. We find interesting correlations between the 850
micron flux and both the i magnitude and the photometric redshift, from which
there appears to be an absence of high redshift faint counterparts to the lower
flux density SCUBA sources. While the quantitative morphologies span a range of
values, in general the sub-mm galaxies show larger sizes and a higher degree of
asymmetry than other galaxy populations at the same redshifts.
