Multibeam echosounder data collected on Southern Surveyor voyage 09/2004 using the Simrad EM300 multibeam echosounder to acquire high resolution seafloor bathymetry and backscatter information. This voyage took place off eastern Australia during October 2004. Ping rate varied according to depth. Data are stored in Simrad *.all raw format at CMAR and Geoscience Australia (GA). There are 77 files totalling 1.9GB of raw data in this dataset. (Note, there are some issues with data quality in this set - refer "lineage"). Additional information regarding this dataset is contained in the cruise report for this voyage and/or the data processing report (as available).