Surface Clarity; To Adjust The Surface Clarity Level - Eagle FISHMARK 640C Installation And Operation Instructions Manual

Fish-finding & depth-sounding sonars
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Sonar Menu with Stop Chart command selected. The box is unchecked,
indicating that the chart is scrolling across the screen.

Surface Clarity

The markings extending downward from the zero line on the chart are
called "surface clutter." These markings are caused by wave action,
boat wakes, temperature inversion and more.
The surface clarity control reduces or eliminates surface clutter signals
from the display. It does this by changing the sensitivity of the receiver,
decreasing it near the surface and gradually increasing it as the depth
increases.
There are three levels of surface clarity available: low, medium or high.
It can also be turned off. The default level is off.

To adjust the Surface Clarity level:

1. From the Sonar Page, press
|↓ to
|
.
MENU
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F
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EATURES
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