Bedienungsanleitung Standard Horizon CP390i - GPS Chart Plotter (Seite 140 von 168) (Englisch)

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CP390i and CPF390i Page 141

17.11.1.0 STC Length

This is the depth range which the STC operates. In custom mode it can be varied from 0FT

to 1000FT (60FT or 255FT on previous software versions). In preset mode it’s value is

reported in the following table (See Par. 17.11.1.2).

17.11.1.1 STC Strength

It is the starting attenuation value of the STC. It acts by attenuating the Gain of the given

percentage value. In custom mode it can be varied from 0% to 100%. The STC effect is

maximum near the surface, to mitigate the Surface Clutter and it progressively diminishes

to 0 at the selected STC depth.

17.11.1.2 Preset values table

OFF Short Mid Long

STC Depth (Ft) 1 60 60 255

STC Length 010% 30% 57%

Figure 17.11.1.2 - STC Preset values table

If in VERY SHALLOW WATER the Fish Finder display is showing a bottom or digital

readout deeper than the actual depth this situation may occur if STC is set to LONG or

MID when the bottom is shallow. This issue may be resolved by adjusting the STC value

to SHORT or even to OFF in very shallow waters.

If in DEEP WATER the Fish Finder display is showing a very shallow bottom or digital

readout this may happen because in conditions of strong Surface Clutter the Fish Finder

may erroneously look on to the Surface Clutter. To solve this situation try to increase the

STC to LONG or to CUSTOM increasing the STC length and strength.

If in DEEP WATER the Fish Finder doesn’t see the bottom, this may happen because the

bottom is out of range or is very near to the maximum depth that can be tracked by the

Fish Finder. In the latter case this may happen if the bottom composition is soft as mud,

if the sea conditions are bad, there are thermoclines or the water is full of suspended

materials (silt, plankton). All these factors may affect considerably the performance of the

Fish Finder to be able to see the bottom. In these cases change the RANGE MODE from

AUTO to MANUAL Range and manually adjust the depth range until the bottom echo

becomes visible on the Fish Finder display.

17.11.2 Surface Noise Filter

An automatic filter that attempts to dynamically remove Surface Clutter that causes the

screen to be filled up with strong return echoes just below the surface. It may seem that

the same functionality could be archived using on the STC control however there is main

difference between such control in fact the STC control impacts the capability to detect

and track the bottom and is not designed to cancel completely the surface noise, on the

other side the Surface Noise Filter attempts to cancel completely the surface noise but it

doesn’t affect the capability to detect and track the bottom.

Filter gradually attenuates surface noises. The Surface Noise Filter has 9 settings: OFF, 1,

..., 8. When it is set to OFF the Surface Noise is not cancelled. When it is set to 1 the Surface

Noise is attenuated from surface down to a depth of 5 Ft, increasing the Surface Noise

increases the depth in which the Surface Noise is attenuated as well as the attenuation level

increases; when the preset is set to 8 the attenuation is maximum and is applied from

surface level down to a depth of 255 Ft, as shown in the following Surface Noise Filter Table:

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