Trawl Line description
The trawl lines are used to show you where the headrope and/or footrope of your trawl are located.
How to open
To activate the trawl lines, click in the echogram view to make it active.
Select Echogram on the Active menu. On the left side of the Echogram dialog box, select Lines to open the page. Select Trawl Line.
Description
Trawl sensor systems (such as Simrad PI, PX and ITI) communicate headrope depth, and/or the distance from the headrope to the footrope (trawl opening), to the
EK80 system at regular intervals. The information can be used to draw the upper and/or lower trawl lines in the echogram. If another trawl or catch monitoring system is used, and this system does not provide the trawl opening and/or trawl distance
automatically, the values must be entered manually.
If you have a compatible catch monitoring system in use, you can use the trawl lines to monitor the depth of the applicable
sensors.
The distance from the headrope to the footrope (trawl opening) can be manually set on the Trawl page. This is useful for trawl sensor systems that do not measure the trawl opening, or when the measured distance is unreliable. You can also provide the distance from the vessel to the trawl opening. The depth of the headrope must however be imported from the catch monitoring system. The Trawl page is located in the Installation dialog box.
This is a visual enhancement. The choice you make has no effect on the overall performance of the EK80 system.