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Operating procedures
Recording and replaying echo data
Choosing which echo data file(s) to replay
When you record echo data the information is stored on the Processor Unit hard disk. Depending on your initial settings, the files can also be stored on an external storage device. The echo data files can be retrieved and played back on the ST90 system.

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
  - Defining the file and folder settings for data recording
    A useful function of the ST90 system is it ability to record echo data. You can save the data to the hard disk, or onto an external storage device. To retrieve the data files you need to know where they are, and which file names that have been used. The data files can be played back on the ST90 system. The data files can later be deleted, copied or moved to another storage device. You can keep the recorded files for future reference, training purposes and calibration.
  - Recording echo data
    Use the data recording functionality provided by the ST90 system to save echo data. The data files can be copied or moved to an external storage device. You can keep the recorded files for future reference, training purposes and calibration. The recording is controlled by the Record function.
  - Locating the echo data files to delete, move or copy them
    Use the data recording functionality provided by the ST90 system to save echo data. You can save the data to the hard disk, or onto an external storage device.
  - Selecting Replay mode
    Replay mode allows you to play back previously recorded raw data. The ST90 system cannot operate normally while in Replay mode. Neither transmission nor reception takes place.
  - Choosing which echo data file(s) to replay
    When you record echo data the information is stored on the Processor Unit hard disk. Depending on your initial settings, the files can also be stored on an external storage device. The echo data files can be retrieved and played back on the ST90 system.
- 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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Choosing which echo data file(s) to replay

When you record echo data the information is stored on the Processor Unit hard disk. Depending on your initial settings, the files can also be stored on an external storage device. The echo data files can be retrieved and played back on the ST90 system.

All playback is controlled by the replay bar.

Stop: Select this button to stop the playback.
Play/Pause: Select this button to start the playback, or to pause it.
Replay Speed: Select this slider and move it sideways to adjust the replay speed.
Replay File: The button shows you which file you are replaying. Select the button to open the Replay File dialog box.
Playback Progress: This bar shows you the progress of the replay sequence. If you have chosen to restart the replay file(s) automatically (in a loop), the green indicator starts from left every time the file restarts.

Procedure

Open the Operation menu.
Select Operation to see the available choices.
Select Replay File to open the dialog box.
The Replay File dialog box allows you to choose which file(s) to be used for playback. The files listed were generated automatically during recording. Each file is identified with the time and date it was made.
Select Add to choose a replay file.
A standard operating system dialog box is used to locate and select the files you wish to use.
If you wish to replay the selected files in an "endless" loop, select Loop.
Select OK to save the selected settings and close the dialog box.
Set Operation to Replay.
The replay bar opens automatically. It is positioned directly below the top bar at the top of the display presentation.