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GPSMAP
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6000/7000 Series Owner’s Manual 87
Radar
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 6000 series. Select > for the GPSMAP 7000 series.
• Congure the setting for the long-range screen in Dual Range mode. Select > > for
the GPSMAP 6000 series. Select > for the GPSMAP 7000 series.
4. Select 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.
5. Select to lower the gain until the speckles disappear.
6. If boats, land, or other targets are within range, select to lower the gain until the targets begin to
blink.
7. Select to raise the gain until the boats, land, or other targets appear steadily lit on the Radar screen.
8. Minimize the appearance of nearby large objects, if necessary (page 87).
9. Minimize the appearance of side-lobe echoes, if necessary (page 87).
Minimizing Nearby Large-object Interference
Nearby targets of signicant 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.
: 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 85).
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 6000 series. Select > for the GPSMAP 7000 series.
• Congure the setting for the long-range screen in Dual Range mode. Select > > for
the GPSMAP 6000 series. Select > for the GPSMAP 7000 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 85).
1. From the Home screen, select .
2. Select , , , or mode.