Garmin echomap chirp 40 series Manuale d'uso - Pagina 22
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penetration. They can be used to search for structures such as
brush piles.
A CHIRP frequency has a better resolution than traditional sonar
frequencies, and displays some smaller targets more clearly.
When the CHIRP frequency is set to high, the screen displays
reduced thermocline. When the CHIRP frequency is set to low,
larger targets are more visible.
Viewing two frequencies at the same time using the split
frequency view allows you to see deeper with the lower
frequency return and to see more detail with the higher
frequency return.
Selecting Frequencies
NOTE: You cannot adjust the frequency for all sonar views and
transducers.
You can indicate which frequencies appear on the sonar screen.
1
From a sonar view, select MENU > Frequency.
2
Select a frequency suited to your needs and water depth.
For more information on frequencies, see
Frequencies, page
17.
Creating a Frequency Preset
NOTE: Not available with all transducers.
You can create a preset to save a specific sonar frequency,
which allows you to change frequencies quickly.
1
From a sonar view, select MENU > Frequency.
2
Select Add.
3
Enter a frequency.
Turning On the A-Scope
NOTE: This feature is not available in all sonar views.
The a-scope is a vertical flasher along the right side of the full-
screen sonar view. This feature expands the most recently
received sonar data so that it is easier to see. It can also be
helpful for detecting fish that are close to the bottom.
From a sonar view, select MENU > Sonar Setup >
Appearance > A-Scope.
Sonar Setup
Sonar Settings
NOTE: Not all options and settings apply to all models, sounder
modules, and transducers.
From a sonar view, select MENU > Sonar Setup.
Depth Line: Shows a quick-reference depth line.
Scroll Speed: Sets the rate at which the sonar scrolls from right
to left.
In shallow water you might want to slow the scroll speed to
extend the length of time the information is displayed on
screen. In deeper water you can increase the scroll speed.
Range Lines: Shows the vertical lines indicating the distance to
the right and left of the boat. This setting is available for
SideVü sonar view.
Color Scheme: Sets the color scheme of the sonar view. This
setting might be available in the Appearance menu.
The high contrast color schemes provide darker color
assignments to the low intensity returns. The low contrast
color schemes provide color assignments to the low intensity
returns that are similar to the background color.
Appearance: See
Sonar Appearance Settings, page
Overlay Numbers: Sets the data shown on the sonar screen.
Advanced: See
Advanced Sonar Settings, page
Installation: Restores the default sonar settings.
18
Sonar Appearance Settings
From a sonar view, select MENU > Sonar Setup >
Appearance.
Color Scheme: Sets the color scheme.
Edge: Highlights the strongest signal from the bottom to help
define the hardness or softness of the signal.
A-Scope: Displays a vertical flasher along the right side of the
screen that shows instantaneously the range to targets along
a scale.
Pic. Advance: Allows the sonar picture to advance faster by
drawing more than one column of data on the screen for
each column of sounder data received. This is especially
helpful when you are using the sounder in deep water,
because the sonar signal takes longer to travel to the water
bottom and back to the transducer.
The 1/1 setting draws one column of information on the
screen per sounder return. The 2/1 setting draws two
columns of information on the screen per sounder return, and
so on for the 4/1 and 8/1 settings.
Sonar
Fish Symbols: Sets how the sonar interprets suspended
targets.
Advanced Sonar Settings
From a sonar view, select MENU > Sonar Setup > Advanced.
Interference: Adjusts the sensitivity to reduce the effects of
interference from nearby sources of noise.
The lowest interference setting that achieves the desired
improvement should be used to remove interference from the
screen. Correcting installation issues that cause noise is the
best way to eliminate interference.
Surface Noise: Hides surface noise to help reduce clutter.
Wider beam widths (lower frequencies) can show more
targets, but can generate more surface noise.
Color Gain: See
TVG: Adjusts the appearance of returns to compensate for
weakened sonar signals in deeper water, and reduces the
appearance of noise near the surface. When the value of this
setting is increased, the colors associated with low-level
noise and fish targets appear more consistent through
various water depths. This setting also reduces the noise
near the surface of the water.
Transducer Installation Settings
From a sonar view, select MENU > Sonar Setup > Installation.
Restore Sonar Defaults: Restores the factory default settings
for the sonar view.
Transducer Type: Allows you to select the type of transducer
that is connected to the device.
Shift: Allows you to set the depth range on which the sonar is
focused. This enables you to zoom in to an area within the
focused depth.
Flip Left/Right: Changes the orientation of the SideVü sonar
view when the transducer is installed backward.
Flipped: Sets the orientation of the Panoptix sonar view when
the transducer is installed with the cables pointing toward the
port side of the boat.
Beam Width: Sets the width of the Panoptix transducer beam.
Narrow beam widths are better for high-speed operation and
18.
rough sea conditions. They also can improve bottom
definition and thermocline definition.
Wider beam widths generate larger arches for fish target
18.
returns, making them ideal for locating fish. Wider beam
widths also perform better in deep water, because the lower
Adjusting the Level of Detail, page
17.
Sonar