"2006-10-06 13:47:30.0" . . "SDN:S04::S04402" . . "2006-10-06 13:47:30.0" . "1" . "single-beam echo sounder"@en . "" . . "1" . . "SDN:S04::S04402" . "false" . "accepted"@en . "SDN:S04::S04402" . "An instrument that measures the depth of water by transmitting a single beam of sound pulses and determining the time taken for the seabed echo to return."@en . . . . . . .