The ST90 is an advanced product. It is used with other advanced products. There is important information that you need to know.

The Simrad ST90 is a low-frequency fish-finding sonar with 360-degree coverage and long range. The ST90 system is designed for medium and large sized fishing vessels.

The system diagram identifies the main components of a basic ST90 system. Only the main connections between the units are shown. Detailed interface capabilities and power cables are not shown.

Safety is important. Observe and follow these safety precautions during all installation and maintenance work.

If a ST90 system is connected to a local area network, data security is important.

If you need technical support for your ST90 system you must contact your local dealer, or one of our support offices. A list of all our offices and dealers is available on our website. You can also contact our main support office in Norway.

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.

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.

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.

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.

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.

To select operating parameters on the ST90 system, use the menu system. The menus are organized in a tree structure with a main menu, a set of secondary menus, and several menu buttons. The menus are organized in a tree structure with a main menu and a secondary menu. Some of the menu buttons open dialog boxes or submenus to offer additional choices.

Each menu provided by the ST90 system contains several menu buttons. Each button shows the purpose of the button. Some of them also display the current setting.

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.

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.

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.

The Setup menu provides basic functions related to the installation parameters and the communication with peripheral systems.

The Active menu offers parameters related to current views and data presentations provided by the ST90 system.

The Objects menu is - in spite of its name and location - not a menu at all. This "menu" opens a small view to monitor and control the objects you have defined in the sonar views. Each object is identified with a visual marker.

The Visual Objects menu controls which graphical elements that are shown in the different views. These graphic elements include markers, vectors and targets that are tracked. The majority of the functions are "on/off" buttons to enable or disable these graphic elements in the various views.

Use the functions on the Cosmetics menu to turn "cosmetic" elements in the sonar presentation on or off.

Shortcut menus provide additional functionality for operation.

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.

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.

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.

The Setup menu provides basic functions related to the installation parameters and the communication with peripheral systems.

The Active menu offers parameters related to current views and data presentations provided by the ST90 system.

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.

The Display Options dialog box is used to specify basic settings for the sonar presentation.

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.

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.

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.

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.

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.