Kongsberg Simrad ST90, Reference Manual

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The length and relative bearing of the ruler is displayed next to it. Once a ruler has been
established you can not make changes to it. You can place as many rulers as you like in
the view.
Select
Delete Ruler
or
Delete All Rulers
on the shortcut menu to delete the one or several
rulers from the view.
Objects menu
The
Objects
menu does not provide any information about rulers.
Related topics
Using markers in the ST90 user interface, page 346
About target tracking
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 .
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.
Once an echo has been provided with a marker in the display presentation it is regarded
as an
object .
In this context, the phrase track (noun) is used to define the movements of a target based
on it geographical position, speed and direction (heading). A track is the output from a
track algorithm implemented in a software program. A track is thus anything the ST90
is tracking either manually (through markers and user interaction) or automatically by
the sonar (target tracking) on your initiative.
A target track permits the ST90 system to automatically control the tilt and bearing based on
the movements of the chosen target. It locks on the target defined by its position, heading
and speed. The bearing and tilt settings are automatically adjusted to follow the movements
of the tracked target.
To start target tracking:
1 Place the cursor over the echo you wish to track.
2 Press
Target Track
on the Operating Panel.
or:
User interface