The geolocation uncertainties are determined by the spatial resolution of the bathymetric data grid and thus by the satellite source. They are expressed as CE90 confidence limits, meaning that 90% of the data fall within the stated horizontal uncertainty. For 2 m bathymetric grids, the horizontal uncertainty is 5 m CE90, for 10 m grids it is 10 m CE90 or better and for 30 m grids it is 30 m CE90.