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Operating procedures
Using the markers and tracking features
Deleting a marker
There are several ways to delete a single marker. You can use the shortcut menu, or select Delete in the Objects menu. You can also use the Operating Panel.

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
  - Starting a position track
    A position track permits the ST90 system to automatically control the tilt and bearing based on the movements of your vessel.
  - Starting a target track
    During normal operation, some echoes are clearly more interesting than others. In many situations specific echoes may be regarded as targets. To set up the ST90 system to provide such information, you can start target tracking.
  - Placing a new marker
    One or more markers can be placed in the view to identify specific echoes. Each marker is shown as a small triangle with or without a short identifying label.
  - Deleting a marker
    There are several ways to delete a single marker. You can use the shortcut menu, or select Delete in the Objects menu. You can also use the Operating Panel.
  - Deleting multiple markers
    There are several ways to delete multiple markers simultaneously.
  - Measuring the size of a school relative to the purse seine
    Estimating the size of a school can sometimes be challenging. A single circle marker can be placed in the display presentation. The circle is drawn with the same diameter as your purse. By means of the circle you can see the size of the school relative to your purse.
  - Using visual aids during the purse seine catch phase
    The gear symbol is provided as a tool to help you plan and shoot the purse seine. The symbol is intended to be used in a structured sequence that starts when you plan to shoot the purse seine.
  - Selecting a geographical area for accurate target tracking
    When you have an echo you wish to track, the tracking functionality places a geographical area around the object. An invisible area - the tracking area - is created as an acquisition area. In order for the ST90 system to find and lock on the intended target, it needs to be kept within this tracking area. If the intended target falls outside the area, the tracking can not be started.
  - Defining the physical size of the tracking area
    When you have an echo you wish to track, the tracking functionality places a geographical area around the object. An invisible area - the tracking area - is created as an acquisition area. In order for the ST90 system to find and lock on the intended target, it needs to be kept within this tracking area. If the intended target falls outside the area, the tracking can not be started. Use the Tracking Area Setup dialog box to define or change the physical size of the tracking area.
  - Choosing the fishing gear in use
    By defining the type of fishing gear you are using, the ST90 system may provide more accurate visual presentations. The Fishing Gear function allows you to define the size of your trawl or purse seine.
  - Changing the fishing gear properties to match your own equipment
    Use the Fishing Gear Setup dialog box to change the fishing gear properties to match your own equipment.
- 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.
Copyright

Deleting a marker

There are several ways to delete a single marker. You can use the shortcut menu, or select Delete in the Objects menu. You can also use the Operating Panel.

You can delete a single marker, or multiple markers simultaneously, by selecting Delete in the Objects menu. If you use Delete Marker on the shortcut menu you can only remove one marker at a time.

Procedure

Open the Objects menu.
In the list of objects, check the box for the object you wish to delete.
Select Delete.

or:

Place the cursor on the marker you wish to delete.
Right-click to open the shortcut menu.
Select Delete Marker.

or:

On the Operating Panel, press the appropriate button to select Delete Oldest Marker.
This action assumes that you have configured one of the buttons on your operating panel to perform this specific function. This configuration takes place on the Operating Panel page. This page is located in the Installation dialog box.
The Mk1 Operating Panel does not support this functionality.