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Operating procedures
Defining the visual information in the sonar views
Placing data from a sea current sensor in the sonar view
A current sensor can be connected to the ST90 system. This can for example be an acoustic Doppler current profiler (ADCP). The information from this sensor is presented in the applicable views.

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
- Getting started
- Choosing operating mode and key transmit parameters
- Controlling the gain and range settings
- Using the markers and tracking features
- Improving the recognition of fish and schools using receiver filters
- Recording and replaying echo data
- Recording and exporting processed echo data
- Capturing the display presentation in image and video files
- Setting up presentation modes and views
- Defining the visual information in the sonar views
  - Selecting true or relative motion behaviour in the views
    In selected views you can control how the vessel symbol shall "behave" in the presentation. The way the vessel moves in the presentation can be chosen either true or relative.
  - Placing data from a sea current sensor in the sonar view
    A current sensor can be connected to the ST90 system. This can for example be an acoustic Doppler current profiler (ADCP). The information from this sensor is presented in the applicable views.
  - Adding markers for external objects to the echo presentation
    Position information from external objects such as buoys, fish aggregating devices and other similar items can be imported into the ST90 system. The external objects are shown as hexagonal markers in the echo presentation.
  - Creating a visual presentation of your vessel’s previous movements
    In order to maintain a visual presentation of your vessel’s previous movements, you can draw these with a line. This line is drawn after the vessel symbol in the sonar views, and visualizes your past movements. We refer to this line as the History Line.
- Defining settings related to user preferences and individual customizing
- Saving, retrieving and maintaining user settings
- Defining the user-selected features on the Operating Panel
- Exporting sensor data, marker positions and technical information
Maintenance procedures
User interface
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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Placing data from a sea current sensor in the sonar view

A current sensor can be connected to the ST90 system. This can for example be an acoustic Doppler current profiler (ADCP). The information from this sensor is presented in the applicable views.

For this functionality to work, a current sensor must be connected to the ST90 system.

The data from the current sensor are presented in the relevant views using text and arrows. Multiple arrows are used if the sensor presents information from more than one layer.

Procedure

Click once in the view that you wish to change.
Open the Display menu.
Select Visual Objects to open the menu.
Set Current Vector to On.
If you select Apply to All your setting is applied to all the views that support the functionality.
Select Display Options.
Observe that the Display Options dialog box opens. This dialog box contains a number of pages selected from the menu on the left side.
Select Current Flow to open the page.
The Current Flow page allows you how to present the direction of the sea current.
Choose the required setting.
- To: Use this setting to present the direction in which the ocean current is flowing.
- From: Use this setting to present the direction from which the ocean current is coming. Observe the inverted arrows.
Select OK to save the selected setting and close the dialog box.