Kongsberg Simrad ST90, Reference Manual

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In this context, the phrase marker is used to identify a visual symbol placed in the
display presentation. 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 position is used to identify a fixed echo in the display presentation that you
wish to act upon. The echo may for example be from a shallow, reef or rock. You
must decide which echoes that shall be classified as positions, and whether you shall
start 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.
Each marker is identified with its geographical location. Once an echo has been
provided with a marker in the display presentation it is regarded as an
object .
To start position tracking:
1 Place the cursor on the echo from a potentially dangerous shallow or reef.
2 Press
Position Track
on the Operating Panel. (Mk1/Mk2)
3 Press
Place Marker
on the Operating Panel. (Mk3)
or:
1 Place the cursor on the echo from a potentially dangerous shallow or reef.
2 Right-click to open the shortcut menu.
3 Select
Place Marker
.
4 Open the
Objects
menu.
5 In the object list, select the object line to activate the control buttons for that particular
object.
6 Select
Priority
to give the currently selected object a priority status.
If another object has this priority, the status is transferred to the new object.
Simrad ST90 Reference Manual