an electrically operated instrument that emits a sound from a vessel's submerged surface and then measures the time interval until return to echo which is recorded, and a graduated scale used to convert the interval into depth
Isixhobo esisetyenziswa ngombane esikhupha isandi kumphezulu otshonileyo wenqanawe nesilinganisa ixesha lekhefu kude kubuyelwe kwintlokoma yesandi esithi sishicilelwe.