GPSMAP
®
4000/5000 Series Owner’s Manual 77
Radar
1. From the Home screen, select .
2. Select , , , or mode.
3. Complete an action:
• Select > for Cruising, Harbor, Offshore, or Sentry mode.
• Congure the setting for the short-range screen in Dual Range mode. Select > > for
the GPSMAP 4000 series. Select > for the GPSMAP 5000 series.
• Congure the setting for the long-range screen in Dual Range mode. Select > > for
the GPSMAP 4000 series. Select > for the GPSMAP 5000 series.
4. Select 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 more-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.
: Depending upon the radar in use, the gain setting congured for use in one radar mode may or may
not be applied to other radar modes or to the Radar Overlay (page 75).
1. From the Home screen, select .
2. Select , , , or mode.
3. Complete an action:
• Select > for Cruising, Harbor, Offshore, or Sentry mode.
• Congure the setting for the short-range screen in Dual Range mode. Select > > for
the GPSMAP 4000 series. Select > for the GPSMAP 5000 series.
• Congure the setting for the long-range screen in Dual Range mode. Select > > for
the GPSMAP 4000 series. Select > for the GPSMAP 5000 series.
4. Select 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 more-distant targets to blink or
disappear from the Radar screen.
Restoring the Default Sea Clutter Setting
: Depending upon the radar in use, the sea clutter setting congured for use in one radar mode may or
may not be applied to other radar modes or to the Radar Overlay (page 75).
1. From the Home screen, select .
2. Select , , , or mode.
3. Complete an action:
• Select > > for Cruising, Harbor, Offshore, or Sentry mode.
• Congure the setting for the short-range screen in Dual Range mode. Select > >
> for the GPSMAP 4000 series. Select > >
for the GPSMAP 5000 series.
• Congure the setting for the long-range screen in Dual Range mode. Select > >
> for the GPSMAP 4000 series. Select > >
for the GPSMAP 5000 series.
4. Select a setting that reects present sea conditions: , , or .
Adjusting Sea Clutter on the Radar Screen
You can adjust the appearance of clutter caused by choppy sea conditions. The sea clutter setting affects the
appearance of nearby clutter and targets more than it affects the appearance of distant clutter and targets. A
higher sea clutter setting reduces the appearance of clutter caused by nearby waves, but it can also reduce or
eliminate the appearance of nearby targets.
: Depending upon the radar in use, the sea clutter setting congured for use in one radar mode may or
may not be applied to other radar modes or to the Radar Overlay (page 75).
1. From the Home screen, select .
