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User interface
Sonar views
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.
Cursor
The distance and depth of the cursor location is shown in the lower left corner of the 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.
    - Bearing
      The bearing for the Vertical view is controlled by the bearing 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.
    - Tilt
      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. When you change the tilt a dotted line presents the requested tilt while the solid line presents the actual tilt.
    - Depth / Range / Range Rings / Variable Range Ring
      Horizontal dotted lines show the depth intervals. Use Depth Dividers on the Cosmetics menu to toggle these lines On or Off.
    - Horizontal TX Sector / Vertical TX Sector
      The Horizontal Tx Sector function controls the "width" of the transmission. The Vertical Tx Sector function is used to change the vertical opening angle in horizontal and vertical swaths.
    - Coverage plot
      In the Vertical view, use Coverage Plot to visualize the area covered by the horizontal beam. Two border lines are added to the Vertical view presentation to indicate the size of the area.
    - Cursor
      The distance and depth of the cursor location is shown in the lower left corner of the view.
    - Markers
      One or more markers can be placed in the view to identify specific echoes. Markers are shown as small triangles. Once an echo has been provided with a marker in the display presentation it is regarded as an object.
    - Purse depth
      A line of X’es in the vertical views shows the bottom of the purse seine.
    - Vertical Reference
      During operations in a vertical view you may wish to focus on the echoes in the upper or lower part of the view.Use Vertical Reference to hide a part of the view. The function is only available in the Vertical and Plane 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.
  - 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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Cursor

The distance and depth of the cursor location is shown in the lower left corner of the view.

The depth is calculated from the current tilt and the distance from the vessel.