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(-det, -der): Dybdemåler, der ved udsendelse af lydsignaler, hvis ekkoer fra bunden opfanges i en modtager, kan bestemme vanddybden på stedet.
echo sounder.
[BI90 p.100, FISØ1, NAV1 p.38, TekNav p.39]
Det samme som det ældre udtryk "fathometer".
fathometer or echo sounding machine is an instrument for determining the depth of water. The fathometer consists of an oscillator that produces a sound, a hydrophone for receiving the echo, and a time measuring element giving the elapsed interval of time between the emission of sound and receiving of the echo.
[SOT p.109]
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