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Functions and dialog boxes
Pages in the Information Pane Options dialog box
The MF90 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.
School Mass Adjustment page
When you have defined a priority target, the information in the Horizontal view includes an estimate of its area and volume. Once you are able to assess your catch, you can use the School Mass Adjustment page to change the weight/volume proportions. This will increase the accuracy of the information in 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 MF90 system. The publication also provides you with a thorough understanding of the parameters and adjustments provided by the MF90 system.
Simrad MF90
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 MF90 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 MF90 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 MF90 system.
- Secondary functions and dialog boxes
- Pages in the Output dialog box
  A key function of the MF90 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 MF90 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 MF90 system.
- Pages in the Installation dialog box
  Before you use the MF90 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.
- Pages in the Information Pane Options dialog box
  The MF90 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.
  - Size Distribution page
    The Size Distribution information pane presents a histogram with the echoes from single fish. The calculations are based on the fact that different fish species have different echo strength. The echo strength also depends on the operating frequency you use. Use the Size Distribution page to define the properties for the histogram shown in the Size Distribution information pane.
  - Fish Position page
    The Fish Position information pane shows the position of the detected single fish echoes. The information pane is only available when an Inspection view is "active". Use the Fish Position page to set up the presentation parameters for the Fish Position information pane.
  - Fish Size Adjustment page
    The Size Distribution information pane presents a histogram with the echoes from single fish. For various reasons, the fish sizes presented in the Size Distribution information pane may be inaccurate. Once you are able to assess your catch, you can use the Fish Size Adjustment page to change the average size of the various species.
  - School Mass Adjustment page
    When you have defined a priority target, the information in the Horizontal view includes an estimate of its area and volume. Once you are able to assess your catch, you can use the School Mass Adjustment page to change the weight/volume proportions. This will increase the accuracy of the information in the view.
Concept descriptions
Technical specifications
The technical specifications summarize the main functional and operational characteristics of the MF90 system. They also provide information related to power requirements, physical properties and environmental conditions.
Datagram formats
The MF90 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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School Mass Adjustment page

When you have defined a priority target, the information in the Horizontal view includes an estimate of its area and volume. Once you are able to assess your catch, you can use the School Mass Adjustment page to change the weight/volume proportions. This will increase the accuracy of the information in the view.

The page is opened in the Information Pane Options dialog box. To open, select the button on the Active menu.

You can also open the page by selecting Setup in the information pane.

The Information Pane Options dialog box is only available when an Inspection view is active.

For the selected specie, adjust the density.