Furuno 1762C, 1753C, 1742, 1752 Erasing Weak Echoes, Appearance of weak echoes, Signal level window

4. VIDEO SOUNDER OPERATION

4.8Erasing Weak Echoes

Sediment in the water or reflections from plankton may be painted on the display in green or light blue (color display) or “spots” on the background (monochrome display). 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

OFF

°SL1

SL2

Monochrome display

Signal level window

4.Use the cursor pad 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 echo colors. Therefore if you do not wish to reduce echo colors use clutter instead.

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