Displaying the Bottom Line

You can display lines on an echogram to mark the bottom of the trawl and the beginning of the seabed.

Procedure

Right-click the echogram, then click Draw Bottom Line.
A yellow line appears at the bottom of the trawl and a white line appears at the beginning of the seabed. On the example below, the first echogram does not have a bottom line and the second has one.
Note: In sensors data, the opening is the distance between the sensor and the yellow line and the height is the distance between the sensor and the white line.