Isis remotely-operated vehicle (ROV) bathymetry data in Marguerite Trough, Antarctica, from James Clark Ross cruise JR157, 2007

Quality of the multibeam bathymetric data was variable with some pervasive issues relating to vehicle motion (pitch/roll artefacts) and positioning during acquisition. Position error of the ROV exceeded the possible bathymetric grid size. The Isis ROV used ultra-short baseline (USBL) to obtain frequent absolute positions (each with rms error of 5 m) to correct for positional inaccuracies. Some raw data files did not import into the Caraibes software thus not all bathymetry data could be processed and included in the final grids. Gridded multibeam bathymetry data have horizontal square grid cell sizes of 0.25 - 0.5 m.