@prefix cpm: . @prefix dc: . @prefix dcat: . @prefix dce: . @prefix dct: . @prefix dcterms: . @prefix grg: . @prefix iop: . @prefix ns0: . @prefix ns1: . @prefix owl: . @prefix pav: . @prefix prov: . @prefix puv: . @prefix qudt: . @prefix rdf: . @prefix rdfs: . @prefix reg: . @prefix sdo: . @prefix semapv: . @prefix skos: . @prefix sssom: . @prefix void: . @prefix xsd: . rdf:type sdo:DefinedTerm ; sdo:description "An instrument that measures the depth of water by transmitting pulses of sound and determining the time taken for the seabed echo to return. Distance is computed assuming that sound travels in sea water at 4800 feet per second."@en ; sdo:inDefinedTermSet ; sdo:name "echo sounder (SV=4800ft/s)"@en ; sdo:termCode "SDN:S04::S04166" .