Furuno FMD-8010 - Manual (Page 20)

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1.6 Adjusting Sensitivity
The GAIN control adjusts the sensitivity of the
receiver and thus the intensity of echoes as they
appear on the screen.
The proper setting is such that the background
noise is just visible on the screen. If you set up
for too little sensitivity, weak echoes may be
missed. On the other hand excessive sensitivity
yields too much background noise; strong targets
may be missed because of the poor contrast be-
tween desired echoes and the background noise
on the display.
To adjust receiver sensitivity, transmit on long
range, and adjust the GAIN control so background
noise is just visible on the screen.
1.7 Adjusting Picture Brilliance
The BRILL control adjusts the brilliance of the
picture.
1.8 Adjusting Brilliance of
Control Panel and Markers
The brilliance of the control panel and markers
can be adjusted on the BRILL menu. The head-
ing marker is visible when set to zero.
1) Press the MENU key.
2) Select the BRILL menu.
3) Press the ENTER/SELECT key.
BRILL1
Sel Item by VRM & hit ENT.
PANEL
TRAIL
CHAR
HDG MARK
VRM/EBL
CURSOR
PLOT
OS MARK
Setting
Current
level
Figure 1-7 BRILL menu
4) Select appropriate menu among the following
and press the ENTER/SELECT key.
PANEL, TRAIL, CHAR, HDG MARK,
VRM/EBL, CURSOR, PLOT, OS MARK
5) Operate the VRM or EBL control to set bril-
liance.
6) Press the ENTER/SELECT key.
7) Press the MENU key.
1.9 Adjusting Range Ring
Brilliance
Push in the RINGS (PUSH) control to adjust
range ring brilliance/turn the range rings on or
off. Each pressing of the key adjusts the brilliance
of the rings (in four levels) or turns them off.