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。

youdao

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。

youdao