Furuno 1823C manual Erasing Weak Echoes, Appearance of weak echoes, Signal level window

4. VIDEO SOUNDER OPERATION

4.8Erasing Weak Echoes

Sediments in the water or reflections from plankton may be painted on the display in green or light blue. These weak echoes may be erased as below.

Weak echoes

Appearance of weak echoes

1.Press the [MENU] key.

2.Press the SOUNDER MENU soft key.

3.Select SIGNAL LEVEL, and press the EDIT soft key to show the signal level window.

SIGNAL LEVEL

▲§

OFF

SL1

SL2

SL3

SL4

°SL5

SL6

▼

16-color display

SIGNAL LEVEL

▲§

OFF

SL1

°SL2

SL3

▼

8-color display

Signal level window

4.Use the trackball to select level of erasure or OFF as appropriate. The higher the number the stronger the echo that will be erased.

5.Press the RETURN soft key followed by the [MENU] key to close the menu.

Note: Unlike “clutter,” signal level reduces display colors. Therefore, if you do not wish to reduce colors, use clutter instead.

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