Depth uncertainties are provided with each data delivery and are expressed as LE90 confidence limits, meaning that 90% of the data fall within the stated depth uncertainty. These uncertainties are a combination of internal model uncertainties (such as the sensitivity of the sensor) and external uncertainties (uncertainties regarding tides) and are compared against on-site or charting data, if accessible. With ideal scenarios and on-site information, EOMAP’s SDB data are accurate to 0.5 m LE90. Without access to on-site information, the uncertainty is typically between 0.5 m and 1.0 m LE90 and a depth dependent factor between 10 and 15% of water depth.