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1·As in the data processing, the output of depth sounder is not stable, causing a high probability of error.

在数据处理方面，测深仪输出的测深数据并不稳定，错误数据出现的概率较大。

2·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。

3·When passing One Fathom Bank, check the depth and variable sand waves below the sea level all the time by echo sounder.

通过一托浅滩时，要一直测深校时水深及海面下多变的沙纹。