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.

Adjusting Gain on the Radar Screen Manually

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.

1From a Radar screen or the Radar overlay, select Menu > Radar Menu > Gain.

2Select 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.

3Select Down to lower the gain until the speckles disappear.

4If boats, land, or other targets are within range, select Down to lower the gain until the targets begin to blink.

5Select Up to raise the gain until the boats, land, or other targets appear steadily lit on the Radar screen.

6Minimize the appearance of nearby large objects, if necessary.

7Minimize the appearance of side-lobe echoes, if necessary.

Minimizing Nearby Large-Object Interference

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.

1From a Radar screen or the Radar overlay, select Menu > Radar Menu > Gain.

2Select 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.

Minimizing Side-Lobe Interference on 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.

1From a Radar screen or the Radar overlay, select Menu > Radar Menu > Gain.

2Select 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.

Adjusting Sea Clutter on the Radar Screen Automatically 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.

1From a radar screen or the radar overlay, select Menu > Radar Menu > Noise Rejection > Sea Clutter.

2Select Presets or Auto.

3Select 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.

Adjusting Rain Clutter on the Radar Screen

You can adjust the appearance of clutter caused by rain. Reducing the radar range also can minimize rain clutter (Zooming In and Out of the Radar Screen).

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.

1From a Radar screen or the Radar overlay, select Menu > Radar Menu > Noise Rejection > Rain Clutter.

2Select 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.

Reducing Cross Talk Clutter on the Radar Screen 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.

Radar Display Settings

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.

Radar Appearance Settings

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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