Furuno 1824C-BB, GD-1920C-BB Erasing Weak Echoes, Appearance of weak echoes, Signal level window

4. VIDEO SOUNDER OPERATION

4.Adjust the Trackball upward or downward to select clutter rejection level desired; 0 (OFF) through 16. The higher the number the higher the degree of suppression. Note that the clutter suppressor may erase weak echoes. Therefore, turn off the clutter when its use is not required.

5.Press the E: RETURN soft key followed by the MENU key to close the menu.

Note: Unlike the signal level feature, clutter does not reduce display colors. However, if you do not wish to change the relation between weak and strong echoes, use signal level instead.

4.7Erasing 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 A: SOUNDER MENU soft key.

3.Select SIGNAL LEVEL, and press the A: 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 E: 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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