All necessary information about your pelagic or bottom trawl are easily collected by an efficient and accurate third wire sonar and sensor system.
Simrad invented the 3rd wire trawl sonar technology in the early 80’s. At that time nobody could foresee the impact these tools and technology have had to the pelagic and semi pelagic fishing industry.
When the first trawl sonar was released, nobody had a 3rd wire winch, and nobody knew how to handle the equipment. This made the learning curve steep. But as always,
if you see the benefit with a new product, you go the extra mile to acquire the necessary skills. In the pelagic and semi pelagic industry the trawl sonar is now so important that hardly anyone leaves port without it.