Gear Symbol

You can activate this function from the short-cut menu or use the dedicated button on the Operating Panel.

The gear symbol may be either a purse seine circle or a trawl symbol. The gear symbol is placed in the echo presentation when you activate it on the operating panel or in the shortcut menu. Which gear symbol to present depends on your choice in the Fishing Gear function.

Open this function from the Setup menu.

Purse seine

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. For use with a purse seine, the intended process follows:

  1. 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.

  2. When you shoot the net:

    • Press Gear on the Operating Panel. — or:
    • Right-click and select Place Gear Symbol on the shortcut menu.

    The first timer starts when you select Place Gear Symbol.

    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. In this phase the Fishing Gear function is disabled.

    The first timer stops when the progress bar reads 100%. This action starts the second timer, which stops when you select Remove Gear Symbol.

  3. 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.

Trawl

If you select a single or dual trawl in the Fishing Gear function, the ST90 system displays a trawl symbol in the echo view. The size and location of the image reflect the measurements you added in the Fishing Gear Setup dialog box.

The trawl image appears aft of the vessel symbol. When your vessel turns, the trawl presentation will reflect this, but the location and movements could be more precise. If you want an accurate trawl positioning, you must equip the trawl with relevant positioning sensors and connect the data to the ST90 system.

Catch view

Use the information in the Catch view to monitor the progress of the purse seine operation. The view does not offer any echo data.

  • 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.
  • 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. The depth is calculated from the sink rate you have defined for the fishing gear. Use Purse Depth on the Cosmetics menu to toggle this line On or Off.
    Tip:

    Under Fishing Gear, select Fishing Gear Setup to open the dialog box. For the selected purse, set the sink rate. For the selected purse, select a depth value.

  • Horizontal dotted lines show the depth intervals. Use Depth Dividers on the Cosmetics menu to toggle these lines On or Off.
  • Relevant information about a priority target can be found in the lower left corner of the view. The information includes the location, speed, course and depth of the target, as well as an estimate of its area and volume.
  • The coverage plot for the Plane view is shown in the Horizontal view.

If you have connected a compatible catch monitoring system to your ST90 system, information from these sensors are shown in the Catch view.

Objects menu

The Objects menu does not provide any information about the gear symbols.