Kongsberg Simrad SN90 Reference Manual page 451

Purse seine and trawling sonar

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Illustration:

Tracking Area

from the inner to the outer radius of the area.

The width of the area is fixed, and stretches across

a predefined number of beams. This means that

the actual width depends on the distance from

your vessel to the area.

function is used to select the

Tracking Area

physical size of the area. You can choose from a set

of predefined sizes.

To track a target efficiently, the area should be as

small as possible. For example, use a small area if

you track single fish or small schools. However, if the

target is large, or moves very fast, a larger area may

be beneficial. This may be useful if you track a large

school of fish.

Tracking Area Setup

You can only define the area size as the distance from the inner to the outer radius of the

area. The width of the area is fixed, and stretches across a predefined number of beams.

Once you have initiated target tracking, the tracked object is identified with a marker.

The bearing line turns to place itself on top of the tracked target.

Under certain circumstances the target tracking may not follow the intended echo. This

may for example happen if the tracking area is too large.

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