Furuno FCV-1200LM - Manual (Page 28)

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1.12 Eliminating Weak Echoes
Dirty water or reflections from plankton may be painted on the display in green or light-blue.
These weak echoes may be erased with the signal level function.
1. Rotate the [FUNCTION] switch to select SIG LEVEL.
The SIGNAL LEVEL menu appears.
Eliminate low
intensity echoes.
[-/+]: Change setting
[EXIT (knob)]: Exit
OFF
SIGNAL LEVEL
Echo colors
disappear from
weakest to
strongest.
SIGNAL LEV : OFF
current
Signal level menu
2. Press the [-] or [+] key to select the setting desired.
9 8 7 6 5 4 3 2 1 OFF
Signal level setting window (For 16 colors)
Every pressing of the [+] key deletes echoes from weakest to strongest in ascending order.
For eight colors, the setting window shows OFF, 1 to 4.
3. Rotate the [FUNCTION] switch fully counterclockwise to select EXIT.