A modern Catch system with Trawl Eye, Flow sensors in the trawl opening and belly, Door Angle sensors and filling indicators, in addition to the traditional sensors that laid the foundation for the development of a full capture system, provides you with so much information of importance to the fishermen that there is a need to use more screens placed in the system. This is of course even more important to those who fish with two or three trawls.
The usual procedure is to use two or three screens on the bridge console and one at the by the winch console, but screens can also be placed in the mess hall or other places where trawl master and others can observe the action.
With the ScanBas system you must switch between the different images, while with ScanScreen you have a complete overview of what you want to focus on in every part of the haul.
There are a number of vessels that have used the ScanScreen for many years, and we only receive positive feedback. It is also a fact that most people who originally bought a ScanBas system, later upgraded.
One point that is worth emphasizing, is that with a ScanScreen system you are able to follow both the Trawl Eye’s detection of fish influx and view snapshots of the geometry, in addition to study of situations that are under development in various log images, such as:
• Door Distance
• Door Angles and stability
• Precise fish influx in the cod end and filling rate
In the geometry image it is worth noting how easy it is to see that the doors are unstable (1), and that it is due to a side current from the starboard (2). At the same time, one can see that the two Catch sensors in use (3) are activated, and that the bag is twisted to starboard.
The Trawl Eye image speaks for itself and you can clearly see where there are concentrations of fish.
The plot image shows the logging of two Filling Indicators (Angle sensors) that are combined with Catch sensors (stretch wire). The curves show the filling rate (repeated in each haul) and the variations show the fish influx. It is easy to see how these correspond with observations in the Trawl Eye image.
It is also worth noting how activation of the Catch sensors (4) is matching the filling rate, but especially how the fish influx take place sometime before the Catch sensors are activated. This information is often used to turn and tow the same area a second time.
From the GPS position you can see exactly where the fish is entering. Also note how the strong record of fish in the Trawl Eye image also appears in the plot image.