Furuno LS-4100 Operator's Manual page 13

Basic ranges (default)
3. Press the [MENU/ESC] key to close
the window.
Shifting the range
The basic range may be shifted up or
down in the manual mode as follows:
Window can be
shifted up and
down to select
the depth.
Range and display shift concept
1. Press the [MENU/ESC] key to open
the main menu.
2. Choose SHIFT from page 1 of the
menu.
3. Press ► to open the shift options
window.
Shift window
4. Use ▲ or ▼ to choose amount of
shift desired.
5. Press the [MENU/ESC] key to close
the window.
Note: The picture may not be displayed
if the amount of shift is greater than
actual depth.
Display
Adjusting the gain
The [GAIN] key adjusts the sensitivity of
the receiver. Generally, use a higher
gain setting for greater depths and a
lower setting for shallower waters.
CAUTION
Gain too high Gain proper Gain too low
Examples of proper and improper gain
1. Press the [GAIN] key and the display
shown below appears.
200k
50k
Gain adjustment window
2. When using the dual frequency
display, press ▲ or ▼ to choose
frequency.
3. Press the [GAIN] key to set. (You
may also use ◄ or ►.) Adjust so that
a slight amount of noise remains on
the screen.
4. Press the [MENU/ESC] key to close
the gain adjustment window.
7
Min Max
2
3