Inspection views
The SN90 system offers five inspection beams. Each inspection beam is presented using an Inspection view. If you use several Inspection views, you can train and tilt the beams individually, and independent of the beams displayed in the other views.
You can use the Inspection view to study single fish, schools and bottom conditions in detail. The echo presentation in the Inspection view resembles the echogram you see on an echo sounder. The Inspection view can be regarded as an "echo sounder" with an adjustable direction.
You can train and tilt the beam independent of the beams displayed in the other views. To change the bearing of the Inspection view, use the Bearing function on the Main menu. You can also click on the solid bearing line in the Horizontal view and drag it.
Certain presentation modes place the Inspection and Plane views together. When three Inspection views are open, the Plane view presents three different bearing lines. Three dotted bearing lines identify the bearing and the selected range of the inspection beams. To change the bearing of an Inspection view:
•  Click in the view you want to activate. Select Bearing on the Main menu.
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A Inspection viewsBearing
B Plane viewBearing
C Range rings
D The position (bearing and distance) and depth of the cursor's location is shown in the lower right corner of the view.
E The current settings for range, gain and tilt are show in the lower left corner of the view.
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With the various beams provided by the SN90 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.
This example shows you how the beams behave in the Trawl Vertical presentation mode.
A Inspection views
B Plane view
This is the active view. The presentation uses a brighter colour.
C Vertical view