Use echo sounder frequently when passing shallow water.

通过浅水域时，要常用回声仪测深。

A device used underwater to produce pulses of sound, as for an echo sounder.

特殊设计的专用降噪消声装置的采用，极大的抑制了机械噪声。

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。

In bathymetric survey, the record seabed image is distorted due to the angular beam width of an echo sounder.

在海洋测深过程中，回声测深仪波束角效应使记录的测深图像失真。