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Garmin echomap chirp 40 series オーナーズマニュアル

From a sonar view, select MENU > Sonar Setup > Overlay

Numbers.

If necessary, select the numbers to customize.

Select the toggle to show or hide each data item.

Select BACK to customize more data.

NOTE: You can also show or hide the compass tape and

navigation inset.

Select Done.

Adjusting the Level of Detail

You can control the level of detail and noise shown on the sonar

screen either by adjusting the gain for traditional transducers or

by adjusting the brightness for DownVü transducers.

If you want to see the highest intensity signal returns on the

screen, you can lower the gain or brightness to remove lower

intensity returns and noise. If you want to see all return

information, you can increase the gain or brightness to see more

information on the screen. This also increases noise, and can

make it more difficult to recognize actual returns.

From a sonar view, select MENU.

Select Gain or Brightness.

Select an option:

• To increase or decrease the gain or brightness manually,

select Up or Down.

• To allow the chartplotter to adjust the gain or brightness

automatically, select an automatic option.

Adjusting the Color Intensity

You can adjust the intensity of colors and highlight areas of

interest on the sonar screen by adjusting the color gain for

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.

From a sonar view, select MENU.

Select an option:

• While in the DownVü or SideVü sonar view, select

Contrast.

• While in a Panoptix LiveVü sonar view, select Color Gain.

• While in another sonar view, select Sonar Setup >

Advanced > Color Gain.

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

Sonar

appear on the screen as long as it appears within the range you

have set.

From a sonar view, select MENU > Range.

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.

TIP: When viewing multiple sonar screens, you can select

SELECT to choose the active screen.

Setting the Zoom Level on the Sonar Screen

From a sonar view, select MENU > Zoom.

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.

Setting the Scroll Speed

You can set the rate at which the sonar image moves across the

screen. A higher scroll speed shows more detail, especially

while moving or trolling. A lower scroll speed displays sonar

information on the screen longer. Setting the scroll speed on

one sonar view applies to all the sonar views.

From a sonar view, select MENU > Sonar Setup > Scroll

Speed.

Select an option:

• To adjust the scroll speed automatically using speed-over-

ground or water speed data, select Auto.

The Auto setting selects a scroll rate to match the boat

speed, so targets in the water are drawn with the correct

aspect ratio and appear less distorted. When viewing

DownVü 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 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 cover a larger

area and can allow you to see more targets, but which also

could 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