echo sounder

音标发音

Use echo sounder frequently when passing shallow water.
通過淺水域時，要常用廻聲儀測深。
blog.sina.com.cn
The echo sounder is now gradually out of use in navigation, because it has many errors.
廻聲測深儀在導航儀器中的地位在下降，其原因是它存在著較多的誤差。
A multi-channel data acquirement and process system was developed to meet the need of the portable echo sounder in the dissertation.
本論文針對某便攜式測深儀的需要，設計開發了一種多通道的數據採集和処理系統。

a piece of equipment, especially on a ship, that uses sound waves to discover water depth or the position of an object in the water

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