Selecting Frequencies; Creating A Frequency Preset; Turning On The A-Scope; Selecting The Transducer Type - Garmin AQUAMAP 80 Series Owner's Manual

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, page 14.

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.

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.
• If you have a 200/50 kHz, dual-frequency transducer,
select Dual Frequency.
• If you have another type of transducer, select it from the
list.

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.
Sonar
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 might want to increase the scroll
speed.
On-screen Control: Sets what the buttons on the sonar screen
control. This is available for touchscreen devices.
Range Lines: Shows the vertical lines indicating the distance to
the right and left of the boat. 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
Overlay Numbers: Sets the data shown on the sonar screen.
Advanced: See
Installation: Restores the default sonar settings.
Sonar

Sonar Appearance Settings

NOTE: Not all options and settings apply to all models, sounder
modules, and transducers.
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.
Color Rejection: Sets which colors are removed from the
screen.
Fish Symbols: Sets how the sonar interprets suspended
targets.

Advanced Sonar Settings

NOTE: Not all options and settings apply to all models, sounder
modules, and transducers.
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
Sonar Appearance Settings, page
Advanced Sonar Settings, page
Adjusting the Level of Detail, page
15.
15.
14.
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