Manual Garmin GPSMAP 7400 series (page 30 of 62) (English)

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Garmin ClearVü or

SideVü sonar views, it is recommend

to use the Auto setting.

• To use a very fast scroll speed, select

Ultrascroll®.

The Ultrascroll option quickly scrolls new sonar data, but

with a reduced image quality. For most situations, the Fast

option provides a good balance between a quickly

scrolling image and targets that are less distorted.

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

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 frequencies.

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.

From a sonar view, select Menu > Frequency.

Select a frequency suited to your needs and water depth.

For more information on frequencies, see Sonar

Frequencies, page 22.

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.

From a sonar view, select Menu >

Frequency

Select Manage Frequencies > New Preset.

Enter a frequency.

Customizing the Panoptix Sonar Views

NOTE:

Not all models support Panoptix transducers.

Adjusting the Appearance of the LiveVü Sonar Views

From a

LiveVü sonar view, select

> Sonar Setup

Select an option:

• To change the colors of the sonar view, select Color

Scheme

, and select an option.

• To adjust the length of the trails that show target

movement, select

Trails, and select an option.

• To distinguish the bottom from the water by coloring the

bottom brown, select Bottom Fill.

• To show or hide the range grid lines, select Grid Overlay.

• To hide or show the history on the side of the screen,

select Scroll History.

Setting the LiveVü

Transducer Transmit Angle

You can change the LiveVü

transducer transmit angle to aim the

transducer at a particular area of interest. For example, you

might aim the transducer to follow a bait ball or focus on a tree

as you pass it.

From a LiveVü sonar view, select Menu

> Transmit Angle

Select an option.

Adjusting the RealVü

Viewing Angle and Zoom Level

You can change the viewing angle of the RealVü sonar views.

You can also zoom in and out of the view.

From a

RealVü sonar view, select an option:

• To adjust the viewing angle diagonally, select .

• To adjust the viewing angle horizontally, select .

• To adjust the viewing angle vertically, select .

• To adjust the viewing angle, swipe the screen in any

direction.

• To zoom in, spread two fingers apart.

• To zoom out, pinch two fingers together.

Adjusting the Appearance of the RealVü Sonar Views

From a RealVü sonar view, select Menu.

Select an option:

• To adjust the depth at which the color palette starts over,

select Palette Depth, and select an option.

• To select a different color palette for the sonar return

points, select Sonar Setup > Point Colors, and select an

option.

• To select a different color palette for the bottom, select

Sonar Setup > Bottom Colors, and select an option.

• To select a different style for the bottom, select Sonar

Setup

> Bottom Style

, and select an option.

• To hide or show the color legend on the side of the

screen, select Sonar Setup > Color Key.

Adjusting the RealVü

Sweep Speed

You can update how quickly the transducer sweeps back and

forth. A faster sweep rate creates a less detailed image, but the

screen refreshes faster. A slower sweep rate creates a more

detailed image, but the screen refreshes more slowly.

NOTE:

This feature is not available for the RealVü 3D Historical

sonar view.

From a

RealVü sonar view, select

> Sweep Speed

Select an option.

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 > On

22 Sonar

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