Automatic Sounder Operation; Manual Sounder Operation - Furuno GP-1610CF Operator's Manual

3.2 Automatic Sounder
Operation
Automatic operation is useful when you are
preoccupied with other tasks and do not have
time to adjust the display.
How it works
The automatic function automatically selects
the proper gain and range scale 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 dis-
play the bottom echo in reddish brown (de-
fault color arrangement).
• Clutter level, (on the VIDEO SOUNDER
SETUP menu), which suppresses low level
noise, is automatically adjusted.
Two types of automatic modes
Two types of automatic modes are available:
cruise and fish. Cruise is for tracking the bot-
tom, and fish is for searching fish schools.
Since "Cruise" uses a higher clutter rejection
setting than "Fish," it is not recommended for
fish detection – weak fish echoes may be de-
leted by clutter rejection.
How to enable automatic sounder
operation
1. Press the AUTO key.
AUTO MODE
Cruise
Fish
Manual
Figure 3-2 Auto mode display
2. Press the AUTO key again to select Cruise
or Fish.
3. Press the ENT or MENU key.
3-2
3.3 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 the range shifting
as moving the "window" to the desired depth.
Manually adjusting the sounder
picture
1. Press the AUTO key to display the AUTO
MODE menu.
2. Press to select Manual.
AUTO MODE
Cruise
Fish
Manual
Low
Gain
Range 5
40 80
Shift 0 m
Figure 3-3 Gain, range and shift
adjustment display
3. Press to select Gain.
Normally, set the gain to the point where
excessive noise does not appear on screen.
Use a higher gain setting for greater depths
and a lower setting for shallower waters.
4. Press t or s to set level.
High
10 20
160 300 m