SIMRAD developed and introduced the first wireless catch sensor more than 40 years ago. Not very late, it also introduced the 3rd wire systems. Since then, SIMRAD manufactures, and keeps developing, a wide range of catch monitoring systems so that the skipper can have full control of the catch process, while enhancing efficiency and respecting the environment. Wireless sensors are developed for fitting in all different fishing scenarios. For example, in bottom trawling, whether it is single, twin, triple or more, wireless sensors are placed on the gear and doors and communicate acoustically with the vessel.

Depending on where they are placed, they can send to the skipper some vital measurements like spread between doors, the fish entering the trawl opening, the filling of the net or the distance from the doors to the bottom - that will prevent them from damaging the fauna -, amongst many others. The 3rd wire is a communication and power cable connected to a scanning trawl sonar placed on the net's headrope. This type of system can be used in pelagic fishery in combination with wireless sensors. These sensors can then communicate with the trawl sonar and the data will go through the 3rd wire up to the vessel.

The advantage of combining both wireless and 3rd wire systems is that down by the trawl the environment for wireless communication is perfect, since there is no propeller noise or long distances. For this specific situation, a 3rd wire winch will be needed.


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