Garmin GPSMAP 8000 Manuale Utente

The chartplotter sets the gain automatically once, based 

on average conditions, the range of the radar signal, and 

the selected radar mode. The chartplotter does not adjust 

the gain automatically in response to changing conditions.

• Select Harbor or Offshore.

The chartplotter automatically adjusts the gain for the 

conditions.

For optimal radar performance, you can manually adjust the 

gain.
NOTE: Depending upon the radar in use, the gain setting 

configured for use in one radar mode may or may not be 

applied to other radar modes or to the Radar overlay.

From a Radar screen or the Radar overlay, select Menu > 

Radar Menu > Gain.

Select Up to raise the gain, until light speckles appear across 

the Radar screen.
Data on the Radar screen is refreshed every few seconds. 

As a result, the effects of manually adjusting the gain may 

not appear instantly. Adjust the gain slowly.

Select Down to lower the gain until the speckles disappear.

If boats, land, or other targets are within range, select Down 

to lower the gain until the targets begin to blink.

Select Up to raise the gain until the boats, land, or other 

targets appear steadily lit on the Radar screen.

Minimize the appearance of nearby large objects, if 

necessary.

Minimize the appearance of side-lobe echoes, if necessary.

Nearby targets of significant size, such as jetty walls, can cause 

a very bright image of the target to appear on the Radar screen. 

This image can obscure smaller targets located near it.
NOTE: Depending upon the radar in use, the gain setting 

configured for use in one radar mode may or may not be 

applied to other radar modes or to the Radar overlay.

From a Radar screen or the Radar overlay, select Menu > 

Radar Menu > Gain.

Select Down to lower the gain until the smaller targets are 

clearly visible on the Radar screen.
Reducing the gain to eliminate nearby large-object 

interference may cause smaller or distant targets to blink or 

disappear from the Radar screen.

Side-lobe interference may appear to streak outward from a 

target in a semi-circular pattern. Side-lobe effects can be 

avoided by reducing the gain or reducing the radar range.
NOTE: Depending upon the radar in use, the gain setting 

configured for use in one radar mode may or may not be 

applied to other radar modes or to the Radar overlay.

From a Radar screen or the Radar overlay, select Menu > 

Radar Menu > Gain.

Select Down to lower the gain until the semi-circular, 

streaked pattern disappears from the Radar screen.
Reducing the gain to eliminate side-lobe interference may 

cause smaller or distant targets to blink or disappear from 

the Radar screen.

You can set the chartplotter to automatically adjust the 

appearance of clutter caused by choppy sea conditions.
NOTE: Depending upon the radar in use, the sea clutter setting 

configured for use in one radar mode may or may not be 

applied to other radar modes or to the radar overlay.

NOTE: Not all options and settings are available on all radar 

and chartplotter models.

From a radar screen or the radar overlay, select Menu > 

Radar Menu > Noise Rejection > Sea Clutter.

Select Presets or Auto.

Select a setting that reflects the present sea conditions.

When using a compatible radar model, the chartplotter adjusts 

the sea clutter based on the sea conditions automatically.

You can adjust the appearance of clutter caused by rain. 

Reducing the radar range also can minimize rain clutter 

(

The rain clutter setting affects the appearance of nearby rain 

clutter and targets more than it affects the appearance of distant 

rain clutter and targets. A higher rain clutter setting reduces the 

appearance of clutter caused by nearby rain, but it can also 

reduce or eliminate the appearance of nearby targets.
NOTE: Depending upon the radar in use, the rain clutter 

settings configured for use in one radar mode may or may not 

be applied to other radar modes or to the Radar overlay.

From a Radar screen or the Radar overlay, select Menu > 

Radar Menu > Noise Rejection > Rain Clutter.

Select Up or Down to decrease or increase the appearance 

of nearby rain clutter until other targets are clearly visible on 

the Radar screen.
Clutter caused by rain may still be visible.

You can reduce the appearance of clutter caused by 

interference from another nearby radar source, when the cross 

talk reject setting is on.
NOTE: Depending upon the radar in use, the cross talk reject 

setting configured for use in one radar mode may or may not be 

applied to other radar modes or to the Radar overlay.

From a Radar screen or the Radar overlay, select Menu > 

Radar Menu > Noise Rejection > Cross Talk Reject.

From any Radar screen or the Radar overlay, select Menu > 

Radar Menu > Radar Setup.
Orientation: Sets the perspective of the radar display. The 

orientation setting applies to every radar mode. This setting 

does not apply to the Radar overlay.

Appearance: Sets the color scheme, look-ahead speed, and 

navigation appearance.

Front of Boat: Compensates for the physical location of the 

radar scanner on a boat, if the radar scanner does not align 

with the bow-stern axis.

From a Radar screen, select Menu > Radar Menu > Radar 

Setup > Appearance.
NOTE: These settings do not apply to the Radar overlay.
Color Scheme: Sets the color scheme.
Look-Ahead Speed: Shifts your present location toward the 

bottom of the screen automatically as your speed increases. 

Enter your top speed for the best results.

Heading Line: Shows an extension from the bow of the boat in 

the direction of travel on the radar screen.

Rings: Shows the range rings that help you to visualize 

distances on the radar screen.

Nav. Lines: Shows the navigation lines that indicate the course 

you have set using Route To, Guide To, or Go To.

Waypoints: Shows waypoints on the radar screen.

Radar

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