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User interface
Using markers in the ST90 user interface
Under normal use, the ST90 system presents several different echoes simultaneously. Some of these are clearly more interesting than others. It can be a challenging task to tell these echoes apart. It can also be hard to keep track of the different echoes as both echoes and your own vessel move. To ease the identification of these echoes you can use markers.

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
User interface
- User interface familiarization
  By default, the display presentation covers the entire screen. The display presentation provided by the ST90 system consists of specific visual elements that work together. The visual elements provide you with the echo information you need, they help you to control the functionality needed to understand this information, and finally, they allow you to control the operational parameters.
- Top bar
- Replay bar description
  During replay, the dedicated replay bar is shown immediately under the top bar. The replay bar allows you to retrieve saved files, and to control the playback.
- Sonar views
- Using markers in the ST90 user interface
  Under normal use, the ST90 system presents several different echoes simultaneously. Some of these are clearly more interesting than others. It can be a challenging task to tell these echoes apart. It can also be hard to keep track of the different echoes as both echoes and your own vessel move. To ease the identification of these echoes you can use markers.
  - Place Marker
    Select Place Marker to create a visual marker symbol at the cursor's current position. Each marker is shown as a small triangle with or without a short identifying label. You can also place a marker by pressing the Place Marker button on the Operating Panel.
  - Target markers
    During normal operation, some echoes are clearly more interesting than others. In many situations specific echoes may be regarded as targets. To keep track of the targets you can use target markers and/or start target tracking. When target tracking is activated, bearing and tilt are automatically adjusted to follow the movements of the tracked target.
  - Circle Marker
    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. You can only add one circle marker to the display presentation.
  - Own Ship Marker
    Select Place Own Ship Marker to add a square symbol to the vessel’s current position in the echo presentation. The own ship marker is intended as a tool in a search situation.
  - Gear Symbol
    You can activate this function from the short-cut menu or use the dedicated button on the Operating Panel.
  - Rulers
    Place Ruler allows you to measure the distance and bearing between two objects in the horizontal view. The function creates a straight line - referred to as a "ruler" - between the objects. The length and relative bearing of the ruler is displayed next to it.
- Using target and position tracking
  The phrase target is used to identify an echo in the display presentation that you wish to act upon.The echo may be from a material item, a shallow, reef or rock, or from fish, fish schools or mammals.In most cases, the target will move and continuously change its position relative to your own vessel.You must decide which echoes that shall be classified as targets, and whether you shall start manual or automatic target tracking. A position track permits the ST90 system to automatically control the tilt and bearing based on the movements of your vessel.
- Informationpanes
- Bottom bar
  The bottom bar is located at the bottom of the display presentation and stretches from the left side to the right side. The tabs on the bottom bar allow you to choose presentation mode.
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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Using markers in the ST90 user interface

Under normal use, the ST90 system presents several different echoes simultaneously. Some of these are clearly more interesting than others. It can be a challenging task to tell these echoes apart. It can also be hard to keep track of the different echoes as both echoes and your own vessel move. To ease the identification of these echoes you can use markers.

In this context, the phrase marker is used to identify a visual symbol placed in the display presentation. A marker is thus a graphical indicator used to identify and highlight specific locations or objects. Placing a marker on an echo identifies the echo as "interesting". It is regarded as an object that you can act upon.
Further classification of this echo as a target must be done manually.

The phrase target is used to identify an echo in the display presentation that you wish to act upon. The echo may be from a material item, a shallow, reef or rock, or from fish, fish schools or mammals. You must decide which echoes that shall be classified as targets, and whether you shall start position or target tracking.

The ST90 system offers several different marker types. You can add as many markers as you like. The most common markers can be added using dedicated buttons on the Operating Panel. Other markers are added using the shortcut menu in each view. Each marker is identified with its geographical location.

Tip:

If you have placed markers on several echoes to make them objects, you can select one of these and give it priority status. The bearing line in the relevant views will automatically be locked on the object with this priority to reflects its bearing. You can only give priority status to one object. The priority is identified with a "P". If you change the tilt and bearing settings manually, the priority status is lost.