Using visual aids during the purse seine catch phase

The gear symbol is provided as a tool to help you plan and shoot the purse seine. The symbol is intended to be used in a structured sequence that starts when you plan to shoot the purse seine.

To provide an accurate visual presentation, the ST90 system needs to know the size of your gear.

The Fishing Gear function allows you to define the size of your trawl or purse seine. This function is opened from the Setup menu.

Use the information in the Catch view to monitor the progress of the purse seine operation. If you have connected a compatible catch monitoring system to your ST90 system, information from these sensors are shown in the Catch view.

Procedure

  1. At the bottom of the display presentation, select a suitable presentation mode, and activate the Catch view.
  2. To start the process: Press Gear on the Operating Panel.

    or:

    Right-click and select Show Gear Symbol on the shortcut menu.

    This places a circle marker in the view. The size and location of the marker is defined by the choices you have made with the Fishing Gear function. Until you proceed, the marker follows the movements of the vessel by keeping its relative location to the bow. This allows you to position your vessel in the best possible location before you shoot the purse seine.

  3. When you shoot the net: Press Gear on the Operating Panel.

    or:

    Right-click and select Show Gear Symbol on the shortcut menu.

    A rectangular marker is placed in the view, and marks the position where the purse seine was shot. The circular marker is disconnected from the vessel movements, and acts as a guideline for your manoeuvring. The history line shows the movements of your vessel. Since the ST90 system knows the length of your net, it places a second marker on this line when half the length has been spent. When the entire net has been spent, a third rectangular marker is shown.

    The progress bar at the top of the Catch view shows you the amount of net that has been spent. The sequence starts when you shoot the net. The estimated depth of the purse seine is shown under the progress bar. The depth is calculated from the sink rate you have defined for the fishing gear.

    • Horizontal dotted lines show the depth intervals.
    • Relevant information about a priority target can be found in the lower left corner of the view.

    A line of X’es in the vertical views shows the bottom of the purse seine. The depth is defined for the fishing gear you have chosen.

  4. When the process is finalized: Press Gear on the Operating Panel.

    or:

    Right-click and select Remove Gear Symbol on the shortcut menu to delete the markers from the view.