N a navigation and position-finding device that determines depth by measuring the time taken for a pulse of high-frequency sound to reach the sea bed or a submerged object and for the echo to return 回声测深仪
Use echo sounder frequently when passing shallow water.
通过浅水域时，要常用回声仪测深。
Inspection installation and water tightness transducer of echo sounder on berth.
测深仪换能器船台安装和水密性检查。
The echo sounder is now gradually out of use in navigation, because it has many errors.
回声测深仪在导航仪器中的地位在下降，其原因是它存在着较多的误差。
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