Erasing Weak Echoes - Furuno 1823C Operator's Manual

4.8

Erasing 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.
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.
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.
Appearance of weak echoes
SIGNAL LEVEL
¤
OFF
¡
SL1
SIGNAL LEVEL
¡
SL2
¡
¤
SL3
¡
¡
SL4
¡
¡
SL5
¡
¡
SL6
16-color display 8-color display
Signal level window
4. VIDEO SOUNDER OPERATION
Weak
echoes
OFF
SL1
SL2
SL3
4-15