Starting A Target Track - Simrad SN90 Operator's Manual

Simrad SN90 Operator Manual
Procedure
1 Place the cursor over the echo you wish to track.
2 Press
Position Track
Result
The marker is shown as a small triangle with or without a short identifying label. Once an
echo has bee provided with a marker in the SN90 presentation it is regarded as an object.
Note
If you change the tilt and bearing settings manually, the position track is disabled. If
you create a new marker and give this priority, the position track is disabled. The same
applies if you start a new target track.
Related topics
Using the markers and tracking features, page 71

Starting a target track

During normal operation, some echoes are clearly more interesting than others. In many
situations specific echoes may be regarded as targets, and it can be useful to receive
continuous information about the location, speed and heading of such targets. To set up
the SN90 to provide such information, you can start target tracking.
Context
A target track permits the SN90 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 tracked target is regarded as an object, and it is identified with a circle
and two lines. The two lines reflect the size of the current tracking area.
The phrase target is used to identify an echo in the SN90 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.
The bearing and tilt settings are automatically adjusted to follow the movements of the
tracked target. The bearing line is automatically locked on the object to reflects its
bearing.
Note
If you change the tilt or bearing settings manually the priority status is lost. The SN90
will still attempt to track the target, but the tilt and bearing settings are not adjusted.
72
on the Operating Panel.
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