Context
Firstly, no matter how the Trawl Unit is mounted on the gear, the most important task will always be to keep it from falling
off during use.
Secondly, you must always mount the unit so that the acoustic beams from the Sonar Head hit and reflect from the targets you wish to see. Make sure that you position the Trawl Unit while considering the tensions on the fishing gear once it has been deployed.
The same tensions may also cause the Trawl Unit to be tilted or pitched. In most cases, if you cannot see the expected targets on the sonar screen, there is nothing wrong with the sonar. Check the pitch and roll values. Is the sonar beam pointing in the right direction? Keep in mind that when the footrope hits the bottom, or the cod end is filled with fish, the location of the footrope may
change.
NoteThere are many different ways to do this installation, and many vessels have established their own procedures and “best practices”
for these tasks. This procedure explains one method suggested by Simrad.
Simrad will not take any responsibility for any loss of or damage to equipment, even if our general installation and/or mounting
procedures have been followed.
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B |
Fourth-wire cable (allow for plenty of slack) |
|
C |
Non-stretchable rope attached to the fourth-wire cable |
|
D |
Rope secured to the headrope to take up the tension |