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Functions and dialog boxes
Pages in the Echogram dialog box
The Echogram dialog box allows you to control the echogram presentation in the Inspection views. Two pages control the horizontal lines and the echogram type with applied TVG (time variable gain). One page controls how fast the echogram travels horizontally across the presentation.
HorizontalAxis page
The echo presentations in the Inspection views resemble the echograms you see on an echo sounder. The echoes travel from right towards left across the echogram presentation. Use the Horizontal Axis to choose the horizontal scale of the echogram. This controls the "speed" of the echoes.

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
Menu system
Functions and dialog boxes
- Main menu: functions and dialog boxes
  The Main menu is located at the top of the menu structure. It offers the most common functions for efficient use of the ST90 system. Unless you hide the entire menu system, the Main menu is visible at all times, even if you close the secondary menus.
- Operation menu: functions and dialog boxes
  The Operation menu allows you to control the operating mode, the recording functionality, and how the ST90 system transmits audio pulses ("ping") into the water.
- Display menu: functions and dialog boxes
  The Display menu provides basic functions related to the screen behaviour and presentation of the echo data. Use the Display menu to control the visual aspects of the system, and to show or hide various elements in the presentation.
- Setup menu: functions and dialog boxes
  The Setup menu provides basic functions related to the installation parameters and the communication with peripheral systems.
- Active menu: functions and dialog boxes
  The Active menu offers parameters related to current views and data presentations provided by the ST90 system.
- Secondary functions and dialog boxes
- Pages in the Output dialog box
  A key function of the ST90 system is its ability to export data. The purpose of the Output dialog box is to collect all functionality related to data output in one easily accessible location.
- Pages in the Display Options dialog box
  The Display Options dialog box is used to specify basic settings for the sonar presentation.
- Pages in the Environment dialog box
  Environmental parameters such as salinity, sound speed and water temperature all play an important part to present accurate echo data. Use the Environment parameters to define these values. Depending on the current sea and weather conditions, you may need to change these values frequently.
- Pages in the Diagnostics dialog box
  The ST90 system is a computerized sonar. There are hardly any analogue circuitry, and the possibility of traditional troubleshooting is limited. In order to rectify this, a built-in software application is available to offer test and maintenance functionality. The Diagnostics dialog box controls the test and diagnose application that checks the performance of the ST90 system.
- Pages in the Installation dialog box
  Before you use the ST90 system you must set it up to communicate with the relevant peripherals. Use the Installation dialog box to set up all interfaces with external devices, and to set up basic parameters related to installation and operation. In most cases, you only need to do this once.
- Pages in the Echogram dialog box
  The Echogram dialog box allows you to control the echogram presentation in the Inspection views. Two pages control the horizontal lines and the echogram type with applied TVG (time variable gain). One page controls how fast the echogram travels horizontally across the presentation.
  - Lines page
    The echo presentations in the Inspection views resemble the echograms you see on an echo sounder. The Lines page in the Echogram dialog box allows you to control the horizontal and vertical lines used in the echogram presentation. You can make the bottom easier to see, and add lines that hold additional information. The vertical scale of the echogram presentation can be changed. If you wish to add annotations to your echogram, these are enabled on this page.
  - Echogram page
    The echo presentations in the Inspection views resemble the echograms you see on an echo sounder. The Echogram page allows you to choose which type of echogram you wish to display. You can also control the TVG (Time Variable Gain). The ST90 system can work with several different TVG compensation settings. The TVG (Time Variable Gain) compensation is designed to counteract the natural phenomena of geometric spread and absorption loss.
  - HorizontalAxis page
    The echo presentations in the Inspection views resemble the echograms you see on an echo sounder. The echoes travel from right towards left across the echogram presentation. Use the Horizontal Axis to choose the horizontal scale of the echogram. This controls the "speed" of the echoes.
- Pages in the Information Pane Options dialog box
  The ST90 system offers several information panes to provide additional and detailed data from the presentations. The information panes are opened and closed from the top bar. Several of the information panes are fitted with a Setup button. Select Setup to open the Information Pane Options dialog box. Use the Information Pane Options dialog box to change the operating parameters for the data provided in the information panes.
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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Horizontal Axis page

The echo presentations in the Inspection views resemble the echograms you see on an echo sounder. The echoes travel from right towards left across the echogram presentation. Use the Horizontal Axis to choose the horizontal scale of the echogram. This controls the "speed" of the echoes.

How to open

This page is located in the Echogram dialog box. The Echogram dialog box is located on the Active menu. The dialog box is only available when an Inspection view is active.

Description

The horizontal scale controls how "fast" the echoes move from right towards left across the presentation. The changes you make are by default only valid for the active Inspection view. Click in the Inspection view to activate it. The active view is identified with a thicker border.

Details

Horizontal Axis

The echoes travel from right towards left across the echogram presentation. Use the Horizontal Axis to choose the horizontal scale of the echogram. This controls the "speed" of the echoes.

Distance: The horizontal scale is based on sailed distance. Select resolution and unit.
Time: The horizontal scale is based on time. Select resolution and unit.
Ping: The horizontal scale is based on the number of transmissions (“pings�?) made. Select View Size to specify that the number of horizontal pixels shall define the number of displayed horizontal pings using one ping per pixel.
Speed: The horizontal scale is based on the relative speed you choose. Select speed with the ruler.

Label

Small labels are shown in the bottom left and right corners of the view. These labels can contain time or distance to identify the horizontal axis of the echogram. You can hide the labels from view.

None: The labels are hidden
Auto: The horizontal scale is set automatically
Time: The horizontal scale is defined by time. The time shown in the bottom right corner of the echogram is then the current time (now).
Distance: The horizontal scale is defined by distance. The distance shown in the bottom right corner of the echogram is then 0 nautical miles (starting point).