In such situations when you see too much clutter on the screen, inncreasing the noise filter will have
an effect. The larger the value is, the more unexpected sonar returns will not be displayed. If the
Noise Filter is increased too high, most sonar returns (which may be fish) will not be displayed.
In a situation where the water is clear, try decreasing the Noise Filter, however in situations where
the water is 'cloudy', then increasing the Noise Filter should be helpful.
When the water is deep enough, the high value setting may greatly affect or even hinder your
FC500 Fish finder's performance to find the bottom. So, in deep water, decreasing the Noise Filter
value will be helpful.
Note:
In some situations you may have big trouble with noise. Try finding and fixing the interference
source, rather than operating your fish finder with a very high Noise Filter value.
To set the Noise Filter:
Press Menu to enter into menu setting.
Repeatedly press Menu to switch to Sonar menu
Use the Up/Down Arrow to select Noise Filter option.
Press Ent to enter into setting.
Use the Up/Down arrow to change the value
Press Ent to confirm and exit the setting.
Grayline (Magic Grayline for FC500)
Grayline is used to let you see both strong and weak signals on the display.
If Grayline is “inversed”, weak returns will be shown with dark pixels and strong returns with
lighter pxels. This is very helpful or ensuring that weak signals will be clearly visible on the
display.
Note:
The magic grayline on the FC500 fish finder is featured by claculation of the sonar program.
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