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The SeaBat 8101 is a 240 kHz Multibeam Echosounder (MBES) System, which measures the relative water depths across a wide swath perpendicular to a vessel's track. The 8101 system illuminates a swath on the sea floor that is 150 degrees across track by 1.5 degrees along track. The swath consists of 101 individual 1.5 degree by 1.5 degree beams (the 210 degree Option uses 141 beams) with a bottom detection range resolution of 1.25 cm. The system was designed to International Hydrographic Organization (IHO) standards to measure the seafloor to a maximum depth of 320 meters. The SeaBat 8101, first produced in the mid-1990's, has been superseded by the SeaBat 7101.