Trawl Monitoring systems from Simrad and Marport allow you to see what your gear is doing. Sensors available include door sensors, catch, height and depth (or combined)
The Simrad FS70 Trawl Sonar combines "the best of two worlds". It communicates with the vessel by means of a third wire system, and with wireless sensors mounted on the trawl by means of hydro-acoustic links.
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