Garmin GPSMAP 800 Series Посібник користувача - Сторінка 21
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traditional transducers or the contrast for DownVü and SideVü/
DownVü transducers. This setting works best after you have
adjusted the level of detail shown on the screen using the gain
or brightness settings.
If you want to highlight smaller fish targets or create a higher
intensity display of a target, you can increase the color gain or
contrast setting. This causes a loss in the differentiation of the
high intensity returns at the bottom. If you want to reduce the
intensity of the return, you can reduce the color gain or contrast.
1
From a sonar view, select MENU.
2
Select an option:
• While in the DownVü or SideVü sonar view, select
Contrast.
• While in another sonar view, select Sonar Setup >
Advanced > Color Gain.
3
Select an option:
• To increase or decrease the color intensity manually,
select Up or Down.
• To use the default setting, select Default.
Adjusting the Range of the Depth or Width
Scale
You can adjust the range of the depth scale traditional and
DownVü sonar views and the range of the width scale for the
SideVü sonar view.
Allowing the device to adjust the range automatically keeps the
bottom within the lower or outer third of the sonar screen, and
can be useful for tracking a bottom that has minimal or
moderate terrain changes.
Manually adjusting the range enables you to view a specified
range, which can be useful for tracking a bottom that has large
terrain changes, such as a drop-offs or cliffs. The bottom can
appear on the screen as long as it appears within the range you
have set.
1
From a sonar view, select MENU > Range.
2
Select an option:
• To allow the chartplotter to adjust the range automatically,
select Auto.
• To increase or decrease the range manually, select Up or
Down.
TIP: From the sonar screen, you can select
manually adjust the range.
Setting the Zoom Level on the Sonar Screen
1
From a sonar view, select MENU > Zoom.
2
Select an option:
• To zoom in on the sonar data from the bottom depth,
select Bottom Lock.
• To set the depth range of the magnified area manually,
select Manual, select View Up or View Down to set the
depth range of the magnified area, and select Zoom In or
Zoom Out to increase or decrease the magnification of
the magnified area.
• To set the depth and zoom automatically, select Auto.
• To cancel the zoom, select No Zoom.
Sonar Frequencies
NOTE: The frequencies available depend on the chartplotter,
sounder modules, and transducer being used.
Adjusting the frequency helps adapt the sonar for your particular
goals and the present depth of the water.
Higher frequencies use narrow beam widths, and are better for
high-speed operation and rough sea conditions. Bottom
Sonar
definition and thermocline definition can be better when using a
higher frequency.
Lower frequencies use wider beam widths, which can let the
fisherman see more targets, but could also generate more
surface noise and reduce bottom signal continuity during rough
sea conditions. Wider beam widths generate larger arches for
fish target returns, making them ideal for locating fish. Wider
beam widths also perform better in deep water, because the
lower frequency has better deep water penetration
Chirp frequencies allow you to sweep each pulse through a
range of frequencies, resulting in better target separation in
deep water. Chirp can be used to distinctly identify targets, like
individual fish in a school, and for deep water applications.
Chirp generally performs better than single frequency
applications. Because some fish targets may show up better
using a fixed frequency, you should consider your goals and
water conditions when using Chirp.
Some sonar black boxes and transducers also provide the
ability to customize preset frequencies for each transducer
element, which enables you to change the frequency quickly
using the presets as the water and your goals change.
Viewing two frequencies concurrently using the Split Frequency
view, allows you to see deeper with the lower frequency return
and at the same time see more detail from 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.
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.
or
to
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.
Selecting the Transducer Type
Before you can select the transducer type, you must know what
kind of transducer you have.
If you are connecting a transducer that was not included with
the chartplotter, you may need to set the transducer type to
make the sonar function properly. If the device automatically
detected your transducer, this option does not appear.
1
From a sonar view, select MENU > Sonar Setup >
Installation > Transducer Type.
2
Select an option:
• If you have a 200/77 kHz, dual-beam transducer, select
Dual Beam.
Sonar
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