Details

Objects

Once an echo has been provided with a marker in the display presentation it is regarded as an object. The table at the top of the Objects menu shows you all the objects that are currently identified with markers. Each marked object is listed with the following information:

ID

The identifier (ID) offers a unique name for each object. Each marker is numbered sequentially.

Objects with allocated markers are identified with an "M" in the Objects menu. Objects that are subjected to target tracking are identified with a "T". You can give priority status to one marker to identify the relevant object as the most important target or position. The priority is identified with a "P".

R

This value presents the range (in metres) from your vessel to the object you have identified with the marker.

B

This value presents the true bearing of the object you have identified with the marker.

This value presents the object’s depth (in metres) relative to the sea surface.

Each marker is specified by its geographical position (latitude and longitude) and its depth. Additional information is provided for objects that are subjected to target tracking.

• Check the box to identify an object you want to act on.
• Select the object line to activate the control buttons and retrieve information about the object.

Select All

Check Select All to select all the objects in the list.

Delete

Select Delete to remove all the objects you have selected in the objects list. Each object is removed from the list and the ST90 presentation.

New

Select New to add a new marker manually. The New Marker dialog box opens to accept the relevant information.

Use this functionality if you need to create a marker based on geographical information from an external source. You can place markers on for example wrecks, obstacles on the seabed or coral reefs. For each new marker you must provide:

• Longitude
• Latitude
• Depth
• Position Input Format

When the new marker is created, it is automatically assigned a unique identifier (UID) by the ST90 system.

Export/Import

Once you have defined any number of objects, you can save them to a file on your hard disk. If necessary, you can retrieve the file later for reuse. The file format is XML. The file is located in the following folder:

c:\ProgramData\Simrad\ST90\Markers

To External

This function is not supported by the ST90 system.

To File

Select To File to save the currently selected objects to a file. The file name reflects the current date and time.

From File

Select From File to retrieve the previously saved objects.

The Import Marker dialog box offers a list of files to choose from. Select a file from the list, then select OK to import it. If one or more of the markers already exist, you can overwrite, rename or cancel the operation.

Control buttons

In the object list, select the object line to activate the control buttons for that particular object.

(A) Priority

You can give priority status to one marker to identify the relevant object as the most important target or position. Select Priority to give the currently selected object a priority status. If another object has this priority, the status is automatically transferred to the new object. The priority is identified with a "P".

(B) Disable Alarm

When you are tracking a moving target, certain target behaviour may trigger an alarm. Select Disable Alarm to disable any alarms for the currently selected tracked target.

(C) Suppress Alarm Audio

You may hear an audio signal when tracking a moving target, and the target behaviour triggers an alarm. The sound is only provided if your Processor Unit is equipped with a loudspeaker. Select Suppress Alarm Audio to disable the audio.

Tip:

The Messages dialog box also provides this functionality. Select Mute Message Sound to disable the audible signal.

(D) Alarm History

All alarms, errors and warnings are listed in the Messages dialog box. Select Alarm History to open the Messages dialog box.

Tip:

Select Messages on the top bar to open the dialog box.

Object information

In the object list, select the object line to retrieve object information about that particular object. Some information is only available for an object that is subjected to target tracking.

Position

Two fields present the geographical position of the currently selected object.

Course/Speed

In the list of objects, select an object on which you have started target tracking. Two fields present the course and speed of the tracked target.

SNR (Signal-to-Noise ratio)/Acceleration

In the list of objects, select an object on which you have started target tracking. One field presents the acceleration of the tracked target. The Signal-to-Noise ratio (SNR) gives the strength of the tracked target relative the noise floor defined by the reference cell in the CFAR filter.

Comment

A text field at the bottom of the Objects menu allows you to type comments. You can only do this if you have computer keyboard connected to your Processor Unit.

Insert Relative Position

Select Insert Relative Position to insert object information into the comment field. The information is inserted as a text string that contains the following information:

• UTC Time
• Relative bearing
• Range to own ship
• Depth