Kongsberg Simrad ST90, Reference Manual

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Minute Markers Tracks
This is an "on/off" switch. When you start a target track, a dedicated marker is used to
identify the object you are tracking. When enabled,
Track History
draws a position
history line after each tracked target. The line identifies the previous positions of the
target. This function adds markers to the track history. These indicate the target’s
travelled distance for each minute.
Track History
When you start a target track, a dedicated marker is used to identify the object you are
tracking. Each marker is shown as a small circle with or without a short identifying
text. In most cases, the target will move and continuously change its position relative
to your own vessel. When enabled,
Track History
draws a position history line after
each tracked target. The line identifies the previous positions of the target. This allows
you to manually predict its current heading.
Estimated Track Area
This is an "on/off" switch. To keep track of the targets you can use target markers
and/or start target tracking . The tracked target is regarded as an object , and it is
identified with a circle and two lines. When target tracking is activated, the bearing
and tilt settings are automatically adjusted to follow the movements of the tracked
target. Relevant information about the tracked object can be found in the bottom left
corner of the view. The information include the location, speed, course and depth of
the target, as well as an estimate of its area and volume. The area is provided in m
2
while the volume is presented as weight in metric tons.
The area and volume information is calculated from selected beams in the Horizontal
view. Due to the noise, acoustic conditions and varying echo strength the size of the
tracked target may change from one ping to the next. This will cause the area and
volume information to change accordingly. Use the
Estimated Track Area
function
to visualize the area estimated by the tracking function. The
Estimated Track Area
function draws a polygon to enclose the target. If this polygon is a lot larger or smaller
than the echo in the view, you can assume that the area and/or volume information
may be inaccurate.
Speed Vector
This is an "on/off" switch.
Speed Vector
shows you the predicted course and speed
of the tracked target. The prediction is based on target’s current movements. The
estimate is limited to one minute. The information is provided with a line indicating
the target’s course. The length of the line reflects its speed.
Bow Marker
This is an "on/off" switch. This function displays a dotted line drawn from the bow of
the vessel symbol. The line reflects your vessel’s current heading. Do not confuse
this line with the bearing line.
Menu system