Furuno 1823C-BB, Operator'S Manual

Page: 151 / 252

4. VIDEO SOUNDER OPERATION
4-9
4.3 Automatic Sounder Operation
Automatic sounder operation is useful when you are preoccupied with other
tasks and do not have the time to adjust the display.
4.3.1 How the automatic sounder works
The automatic sounder function automatically selects the proper gain, range
scale and clutter suppression level according to the depth. It works as follows:
•
The range changes automatically to locate the bottom on the lower half of the
screen. The range jumps to one step shallower range when the bottom
echoes reach a half way point of the full scale from the top and to one step
deeper range when they come to the lower edge of the scale.
•
The gain is automatically adjusted to display the bottom echo in reddish brown
(default color arrangement).
•
Clutter, which suppresses low level noise, is automatically adjusted.
4.3.2 Types of automatic sounder modes
Two types of automatic sounder modes are available: CRUISING and FISHING.
CRUISING is for tracking the bottom, and FISHING is for searching fish schools.
CRUISING uses a higher clutter rejection setting than FISHING therefore it is not
recommended for fish detection - weak fish echoes may be erased by the clutter
suppression circuit.
4.3.3 How to enable automatic sounder operation
1. If not displayed, press the [HIDE/SHOW] key to show the sounder soft keys.
2. Press the B:AUTO/D. BOX soft key.
AUTO MODE
▲
¤
CRUISING
¡ FISHING
¡ OFF (MANUAL)
▼
Mode/frequency window
3. Use the trackball or the [ENTER] knob to select CRUISING or FISHING as
appropriate.
4. Press the E:RETURN soft key.
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