Garmin GPSMAP 1000 Series, Owner'S Manual

Installation

: Configures the transducer (

Traditional, Garmin 

ClearVü, and SideVü Transducer Installation Settings

, 

page 27

).

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 

Set Zoom

, 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 

Set 

Zoom

 > 

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.

1

From a sonar view, select 

MENU

 > 

Sonar Setup

 > 

Scroll 

Speed

.

2

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 

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.

Adjusting the Range of the Depth or Width Scale

You can adjust the range of the depth scale traditional and 

Garmin ClearVü 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   or   to 

manually adjust the range.

TIP: 

When viewing multiple sonar screens, you can select 

SELECT to choose the active screen.

Sonar Noise Rejection Settings

From a sonar view, select 

MENU

 > 

Sonar Setup

 > 

Noise 

Reject

.

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.

Color Limit

: Hides part of the color palette to help eliminate 

fields of weak clutter.
By setting the color limit to the color of the undesired returns, 

you can eliminate the display of undesired returns on the 

screen.

Smoothing

: Removes noise that is not part of a normal sonar 

return, and adjusts the appearance of returns, such as the 

bottom.
When smoothing is set to high, more of the low-level noise 

remains than when using the interference control, but the 

noise is more subdued because of averaging. Smoothing can 

remove speckle from the bottom. Smoothing and interference 

work well together to eliminate low-level noise. You can 

adjust the interference and smoothing settings incrementally 

to remove undesirable noise from the display.

Surface Noise

: Hides surface noise to help reduce clutter. 

Wider beam widths (lower frequencies) can show more 

targets, but can generate more surface noise.

TVG

: Adjusts the time varying gain, which can reduce noise.

This control is best used for situations when you want to 

control and suppress clutter or noise near the water surface. 

It also allows for the display of targets near the surface that 

are otherwise hidden or masked by surface noise.

Sonar Appearance Settings

From a sonar view, select 

MENU

 > 

Sonar Setup

 > 

Appearance

.

Color Scheme

: Sets the color scheme.

Color Gain

: Adjusts the intensity of colors (

Adjusting the Color 

Intensity

, page 25

).

A-Scope

: Displays a vertical flasher along the right side of the 

screen that shows instantaneously the range to targets along 

a scale.

Depth Line

: Shows a quick-reference depth line.

Edge

: Highlights the strongest signal from the bottom to help 

define the hardness or softness of the signal.

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.

Echo Stretch

: Adjusts the size of the echoes on the screen to 

make it easier to see separate returns on the screen.
When targets are difficult to see 

À

, echo stretch makes the 

target returns more pronounced and easier to see on the 

screen. If the echo stretch value is too high, the targets blend 

together. If the value is too low 

Á

, the targets are small and 

more difficult to see.

26

Sonar Fishfinder