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Operating procedures
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.

Purpose
Document information
About this manual
The purpose of this publication is to provide the descriptions and procedures required to allow for efficient use of the ST90 system. The manual does not contain detailed information about functions, dialog boxes and operating parameters.
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
User interface
Menu system
Functions and dialog boxes
The functions and dialog boxes provided in the ST90 user interface are not described in this publication.
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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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.

This function is not available in all the views.

Procedure

Open the Display menu.
Locate the Motion function.
Select [+] or [-] to choose the requested setting.
True Motion
In True Motion mode, the view is kept geographically motionless. The vessel symbols moves around in the view to reflect its true movements. If the symbol attempts to leave the view, the presentation is automatically adjusted.
Relative
In Relative mode, the view is continuously updating its geographical position and orientation based on the vessel movements. The vessel symbols is kept motionless at the centre of the view.
Select the middle of the button to open a small menu with the available options.