Bedienungsanleitung Standard Horizon FF-525 (Seite 28 von 32) (Englisch)

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surface to the bottom). Try decreasing the STC value to SHORT in shallow waters or to

switch it to VERY SHORT or OFF.

Auto Range fails, and the digital depth readout displays a very shallow

reading. What should I do?

This usually happens if the STC is off or is set to a low value causing disturbance from

Surface Clutter to be stronger than bottom echoes. Try increasing the STC value. As

general rule STC has to be set as in shallow waters and LONG in depth waters.

Auto Range fails in very deep waters displaying a digital very shallow depth

readout. What should I do?

The Fish Finder capability to detect the bottom decreases as the bottom depth increase. If

the bottom composition is soft as mud, if the sea conditions are bad, if there are thermoclines

or the water is full of materials in suspension it can further decrease thus causing the digital

depth readout to fail. When this happens the Auto Range algorithm also fails. To recover

from this situation it is necessary to switch to Manual Range mode and to set the Manual

Depth mode. When Manual Depth mode is selected the algorithm that calculates the digital

depth readout searches for the bottom within the range manually selected by the user. At

this point it is necessary to increase manually the Range until the bottom becomes

graphically visible. If the echoes from the bottom are strong enough, the Fish Finder shall

look to the bottom giving a correct depth reading and shall be possible to return in Auto

Range mode. Please note that if one or more of the conditions that reduce the echoes from

the bottom listed above is true the bottom may be not visible at all, in this situation a strong

thermocline or Surface Clutter may be interpreted by the Fish Finder as the bottom.

At a very shallow range upper half of the screen appears almost completely

filled by the Surface Clutter. How can I eliminate it?

This is normal in shallow waters. To clean up the Surface Clutter without degrading the

digital depth readout algorithm functionality there are two modes:

1. If Surface Declutter = OFF it is possible to set the STC value to custom setting the STC

length to the same size of the Surface Clutter, and increasing the STC strength until the

image on the screen cleans up. Please note that in very shallow waters it is usually better

to switch to Manual Gain mode to reduce Gain fluctuation due to rapidly changing

bottom conditions.

2. Using Surface Declutter, increase the Surface Declutter value until the Surface

Declutter disappears completely.

Why do I never see fish in the range between 0 to 2 Ft?

The minimum range of the Fish Finder is 2 Ft. In this interval the Fish Finder can detect

neither the bottom nor any target.

How can I reduce the Surface Clutter?

You can act by: properly setting the STC and also by increasing the NOISE LEVEL and

reducing the GAIN or the GAIN OFFSET (if you are in Auto Gain mode). However please

note that a strong attenuation of Surface Clutter may also reduce the capability to detect

targets.

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