Getting to know presentation modes and views
The SU90 presentation offers several views. Different combinations of views are organized in presentation modes.
Context
The SU90 system presents the echo data in different views. All information from each ping is shown in all the views simultaneously. Each view uses its individual transmit frequency, and you set up the different views with different operating parameters. The behaviour of the echoes in each view is controlled by your course and speed combined with the movements of the target(s).
The following views are available:
•  Horizontal
•  Vertical
•  270 Vertical
•  Catch
•  Echogram
•  Plane
Tip
With the various beams provided by the SU90 system, it may be difficult to understand the concepts. How do these beams "behave" in the water? By means of a graphic presentation, the Beam Visualization dialog box attempts to give you a better understanding of how the acoustic beams are transmitted into the water. Open the Beam Visualization dialog box from the Setup menu.
Procedure
1 At the bottom of the display presentation, select a suitable presentation mode, and activate the Horizontal view.
The view presents the 360 degrees area around your vessel in bird’s eye view. The current bearing is shown with a continuous line pointing out from the vessel position. You can change the angle by means of the Bearing function on the Main menu. You can also select the bearing line and drag it sideways.
The bow marker is shown as a dotted line drawn from the bow of the vessel symbol. The line reflects your vessel’s current heading. The bow marker can be enabled or disabled on the Visual Objects menu.
The distance from the vessel symbol in the centre of the circle to the outer ring corresponds to the currently selected range.
•  The current settings for range, gain and tilt are shown in the upper left corner of the view. When you change the tilt a dotted line presents the requested tilt while the solid line presents the actual tilt. You can change the tilt angle by means of the Tilt function on the Main menu. You can also click on the tilt line in a Vertical view and drag it up and down.
•  The position (bearing and distance) and depth of the cursor location is shown in the lower right corner of the view. The depth is calculated from the current tilt and the distance from the vessel.
•  The course and speed of the latest marker is found in the lower right corner of the view. The values are calculated based on the last two markers you placed and the time between each placement.
•  Relevant information about a priority object can be found in the lower left corner of the view.
The Cosmetics menu controls which graphical elements that are shown.
2 At the bottom of the SU90 presentation, select a suitable presentation mode, and activate the Vertical view.
The view shows you a "vertical slice" of the echo data. The slice is made at the current bearing. The area covered by the vertical beam is shown as a triangle in the Horizontal view. You can change the bearing on the Main menu. You can also select the bearing line in a Horizontal view and drag it sideways.
The upper horizontal line in the view represents the water surface.
•  Horizontal dotted lines show the depth intervals. Use Depth Dividers on the Cosmetics menu to toggle these lines On or Off.
•  The selected range is divided into identical distances. These are shown as dotted circles. They are referred to as range rings.
•  The distance and depth of the cursor location is shown in the lower right corner of the view.
The current tilt is shown with a solid line. You can change the tilt angle by means of the Tilt function on the Main menu. You can also click on the tilt line and drag it up and down.
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. Under Fishing Gear, select Fishing Gear Setup to open the dialog box. For the selected purse, select a depth value. Use Purse Depth on the Cosmetics menu to toggle this line On or Off.
The Cosmetics menu controls which graphical elements that are shown.
3 At the bottom of the SU90 presentation, select a suitable presentation mode, and activate the 270 Vertical view.
The 270 Vertical view is designed for purse seining. The view combines a horizontal "bow up" presentation with a vertical slice. The vertical half slice is displayed in the lower left corner for when the net is set out on the starboard side. If the net is set on the port side, the vertical slice is displayed in the lower right hand corner. The area covered by the vertical beam is shown as a triangle in the Horizontal view.
This view makes it easy to keep contact with the school. You can determine its size distribution, and monitor the position the school relative to the bottom.
The throw side is defined for the fishing gear you have chosen. Under Fishing Gear, select Fishing Gear Setup to open the dialog box. For the selected purse, set throw side to Port or Starboard.
4 At the bottom of the display presentation, select a suitable presentation mode, and activate the 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. You must then press Gear on the operating panel or select Place Gear Symbol on the shortcut menu.
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. Under Fishing Gear, select Fishing Gear Setup to open the dialog box. For the selected purse, set the sink rate.
•  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 object 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. Under Fishing Gear, select Fishing Gear Setup to open the dialog box. For the selected purse, select a depth value. Use Purse Depth on the Cosmetics menu to toggle this line On or Off.
If you have connected a compatible catch monitoring system to your SU90 system, information from these sensors are shown in the Catch view.
5 At the bottom of the SU90 presentation, select a suitable presentation mode, and activate the Echogram view.
The Echogram view provides echo data from a horizontal beam in a common echogram presentation. The echo data is taken from the current bearing and tilt. The beam used to provide data is identified in the top left corner of the view. Horizontal dotted lines show the depth intervals.
•  You can change the bearing on the Main menu. You can also select the bearing line in a Horizontal view and drag it sideways.
•  You can change the tilt angle by means of the Tilt function on the Main menu. You can also click on the tilt line in a Vertical view and drag it up and down.
Left-click in the Echogram view to open the tooltip. The tooltip provides the cursor location in the echogram (slant range, true range and depth) as well as the current pulse duration and time.
The Horizontal Scroll function controls how fast the echo presentation shall move from right towards left in the Echogram and Inspection views. The speed is controlled by adjusting the number of pixels used to present each ping. A higher speed will update the view faster, but will also reduce the resolution.
6 At the bottom of the SU90 presentation, select a suitable presentation mode, and activate the Plane view.
The Plane view presents the echo data in a horizontal sector ("fan"). The sector direction can be changed in both vertical and horizontal directions. The tilt is drawn in the Vertical and Horizontal views as two dotted lines. The same dotted lines are shown in the Horizontal view as a dedicated bearing line to visualize the direction of the plane beam.
•  You can change the bearing on the Main menu. You can also click on the dedicated dotted bearing line in a Horizontal view and drag it.
•  You can change the tilt angle by means of the Tilt function on the Main menu.
The Horizontal Tx Sector function defines the opening angle of the sector. It can be set to 360°.
•  The selected range is divided into identical distances.
•  The distance and depth of the cursor location is shown in the lower right corner of the view.
•  The current settings for range, gain and tilt are show in the lower left corner of the view.
Tip
To fully understand how the beams behave in this view, use the Beam Visualization dialog box.