Furuno GP-1640F, Руководство оператора, Страница: 21 / 108

2-5
2.5 Automatic Sounder
Operation
Automatic sounder operation is useful when
you are preoccupied with other tasks and do
not have time to adjust the display.
How the automatic sounder works
The automatic sounder function automatically
selects the proper gain, range scale and clutter
suppression level according to depth. It works
as follows:
•
Range changes automatically to locate the
bottom on the lower half of screen. It jumps
to one step shallower range when bottom
echoes reach a half way point of the full
scale from top and to one step deeper range
when they come to the lower edge of scale.
•
The gain is automatically adjusted to display
the bottom echo in the color in the darkest
tone.
•
Clutter, which suppresses low level noise, is
automatically adjusted.
Two types of automatic 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.
How to enable automatic operation
1. To show the mode/freq window:
Normal sounder display:
Press the
MODE/FREQ soft key.
Plotter/sounder display:
Press the SNDR,
MODE/FREQ soft keys in order.
Dual-frequency display
: Press the MODE
soft key.
MODE/FREQ
AUTO CRUISING
AUTO FISHING
MANUAL
Mode/frequency window
2. Press ▲ or ▼ to select AUTO CRUISING
or AUTO FISHING.
3. Press the RETURN soft key to close the
window automatically, or wait 10 seconds
and the window closes automatically.
2.6 Manual Sounder
Operation
Manual operation is useful for observing fish
schools and bottom using fixed gain setting.
The gain, range and range shifting functions
used together give you the means to select the
depth you can see on screen. The basic range
can be thought of as providing a “window” into
the water column and range shifting as moving
the “window” to the desired depth.
Selecting the manual mode
1. Press the appropriate soft key to show the
mode/freq window.
2. Select MANUAL.
3. Press the RETURN soft key.
Selecting display range
Press the RANG soft key to show the range
window, and select range by the cursor. Press
the RETURN soft key to finish.
RANGE
15 ft
30 ft
60 ft
120 ft
200 ft
400 ft
1000 ft
2500 ft
Range window