Trawl Monitoring systems from Simrad allow you to see what your gear is doing. Sensors available include door sensors, catch, height and depth (or combined)
The Simrad FS70 and FS80 Trawl Sonars combines "the best of two worlds". They 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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