Echo Sounder is a kind of acoustic measuring depth equipment, which can measure depth with the time between transmitted wave and echo on condition in which the speed of ultrasonic is fixed.
回声测深仪是用来测量水深的一种声学测量设备，其以水中超声波的传播速度为确定条件，利用发射波与反射回波时间差来测量水深。
Use echo sounder frequently when passing shallow water.
通过浅水域时，要常用回声仪测深。
The Parktronic system operates on the echo-sounder principle.
驻车定位系统根据回波发声器原理工作。
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