. "multibeam echo sounder central beam"@en . "accepted"@en . . "Water depth measurement by determining the time taken for the seabed echo to return from the central, vertical sound pulse beam of a fan-shaped multibeam array."@en . . "SDN:S04::S04396" . "2006-10-06 13:47:30.0" . "SDN:S04::S04396" . "" . "1" . "1" . "false" . . "2006-10-06 13:47:30.0" . . "SDN:S04::S04396" . . . . . .