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User interface
Sonar views
Inspection view
The ST90 system offers three 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.
Bearing
The echo data is taken from the current bearing and tilt. With maximum three Inspection views in use, the individual bearings are controlled from the Horizontal view.

About this manual
The purpose of this publication is to provide the descriptions, procedures and detailed parameter explanations required to allow for safe and efficient use of the ST90 system. The publication also provides you with a thorough understanding of the parameters and adjustments provided by the ST90 system.
Simrad ST90
Operating procedures
Maintenance procedures
User interface
- User interface familiarization
  By default, the display presentation covers the entire screen. The display presentation provided by the ST90 system consists of specific visual elements that work together. The visual elements provide you with the echo information you need, they help you to control the functionality needed to understand this information, and finally, they allow you to control the operational parameters.
- Top bar
- Replay bar description
  During replay, the dedicated replay bar is shown immediately under the top bar. The replay bar allows you to retrieve saved files, and to control the playback.
- Sonar views
  - Presentation modes
    All echoes offered by the ST90 system are shown in rectangular views. Combinations of these views are organized in presentation modes. Each presentation mode offered by the ST90 system provides a selection of views in a predefined pattern. You must first find the presentation mode that meets your operational requirements, then you can change the size of the individual views.
  - Horizontal view
    The Horizontal view presents the 360 degrees area around your vessel from a bird’s eye view. The current bearing is shown with a solid line pointing out from the vessel position.
  - Vertical view
    The Vertical view is oriented perpendicularly to the horizontal plane. The Vertical view shows you a "vertical slice" of the echo data. The direction of the vertical slice is indicated and controlled by the bearing line in the Horizontal view. The area covered by the vertical beam is shown as a triangle in the Horizontal view. The upper horizontal line in the view represents the water surface.
  - Inspection view
    The ST90 system offers three 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.
    - Bearing
      The echo data is taken from the current bearing and tilt. With maximum three Inspection views in use, the individual bearings are controlled from the Horizontal view.
    - Tilt
      The echo data is taken from the current bearing and tilt. The current tilt is shown with a solid line in the Vertical view.
    - Range
      The distance from the lower part to the upper part of the view corresponds to the currently selected range.
    - Horizontal scroll
      Small labels are shown in the bottom left and right corners of the view. These labels show you the time in order to identify the scale of the horizontal axis.
    - Tooltips
      When you move the cursor over the echo data in the Echogram and Inspection views, small "tooltips" are shown to provide additional information.
  - 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.
  - Echogram view
    The Echogram view shows a time based history for a selected beam. Horizontal dotted lines show the depth intervals. The beam used to provide data is identified in the top left corner of the view.
  - 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.
  - 270 Vertical view
    The 270 Vertical view is designed for purse seining. The presentation combines a horizontal "bow up" presentation with a vertical slice.
- Using markers in the ST90 user interface
  Under normal use, the ST90 system presents several different echoes simultaneously. Some of these are clearly more interesting than others. It can be a challenging task to tell these echoes apart. It can also be hard to keep track of the different echoes as both echoes and your own vessel move. To ease the identification of these echoes you can use markers.
- Using target and position tracking
  The phrase target is used to identify an echo in the display presentation that you wish to act upon.The echo may be from a material item, a shallow, reef or rock, or from fish, fish schools or mammals.In most cases, the target will move and continuously change its position relative to your own vessel.You must decide which echoes that shall be classified as targets, and whether you shall start manual or automatic target tracking. A position track permits the ST90 system to automatically control the tilt and bearing based on the movements of your vessel.
- Informationpanes
- Bottom bar
  The bottom bar is located at the bottom of the display presentation and stretches from the left side to the right side. The tabs on the bottom bar allow you to choose presentation mode.
Menu system
Functions and dialog boxes
Concept descriptions
Technical specifications
The technical specifications summarize the main functional and operational characteristics of the ST90 system. They also provide information related to power requirements, physical properties and environmental conditions.
Datagram formats
The ST90 system can send and receive information to and from several different peripherals. All transmissions take place as datagrams with data sentences. Each datagram has a defined format and length.
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Bearing

The echo data is taken from the current bearing and tilt. With maximum three Inspection views in use, the individual bearings are controlled from the Horizontal view.

The current bearings are shown with solid and dotted lines pointing out from the vessel position. The line in the identifier reflects the line type used in the Horizontal view to show the bearing.

You can change the angle by means of the Bearing function on the Main menu. You can also select the bearing line in a Horizontal view and drag it sideways.