Garmin GPSMAP 8000 Manuale Utente

NOTE: When the bottom lock feature is enabled, the 

Range feature changes to Span.

• 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.

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 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.

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.
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.

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 > Sonar Menu > 

Frequency.

Select a frequency suited to your needs and water depth.
For more information on frequencies, see 

.

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 > Sonar Menu > 

Frequency.

Select Manage Frequencies > New Preset.

Enter a frequency.

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 Menu > Sonar 

Setup > Appearance > A-Scope > On.

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.

From a sonar view, select Menu > Sonar Setup > 

Installation > Transducer Type.

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.

NOTE: Not all options and settings apply to all models, sounder 

modules, and transducers.

From a sonar view, select Menu > Sonar Menu > Sonar 

Setup.
Scroll Speed: Sets the rate at which the sonar scrolls from right 

to left (

In shallow water, you can select a slower scroll speed to 

extend the length of time the information is displayed on 

screen. In deeper water, you can select a faster scroll speed. 

Automatic scroll speed adjusts the scrolling speed to the 

speed the boat is traveling.

Noise Reject: Reduces the interference and the amount of 

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