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Operating procedures
Getting started
Turning off the ST90 system
When you do not use the ST90 system, turn it off. Select Power Off on the top bar to turn off the ST90 system. You can also use the Power button on the Operating Panel. You must never turn off the ST90 system by means of the on/off switch on the Processor Unit.

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
  - Turning on the ST90 system
    To use the ST90 system, you must first turn it on. To turn on the ST90 system use the Power button on the Operating Panel. The ST90 program starts automatically when the Processor Unit is turned on.
  - Lowering and hoisting the transducer from the user interface
    The Operating Panel controls the lowering and hoisting of the transducer. Dedicated buttons are provided for the physical transducer locations. You can also control the transducer movements from the top bar.
  - Turning off the ST90 system
    When you do not use the ST90 system, turn it off. Select Power Off on the top bar to turn off the ST90 system. You can also use the Power button on the Operating Panel. You must never turn off the ST90 system by means of the on/off switch on the Processor Unit.
- 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
- 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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Turning off the ST90 system

When you do not use the ST90 system, turn it off. Select Power Off on the top bar to turn off the ST90 system. You can also use the Power button on the Operating Panel. You must never turn off the ST90 system by means of the on/off switch on the Processor Unit.

Procedure

Select Power Off on the top bar.
In the Power Off dialog box, select Power off or Exit to Operating System.
- Power Off turns off the Processor Unit and the Transceiver Unit.
- Exit to Operation System closes the ST90 program.
- Both functions will also retract the transducer.

or:

On the Operating Panel, press Power, and keep it depressed for a few seconds.
In the Power Off dialog box, select Power off or Exit to Operating System.
Wait while the ST90 program closes and the Transceiver Unit is turned off.
Turn off the display.
If required, refer to the instructions provided by the display manufacturer.