Garmin GPSMAP 700 - Page 74

70 GPSMAP
®
700 Series Owner’s Manual
Radar
Minimizing Nearby Large-object Interference
Nearby targets of signicant 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 congured for use in one radar mode may
or may not be applied to other radar modes (page 69).
1. From the Home screen, select
Radar.
2. Select
Cruising, Harbor, Offshore, or Sentry mode.
3. Select
Menu > Gain.
4. 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 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.
NOTE
: Depending upon the radar in use, the gain setting congured for use in one radar mode may
or may not be applied to other radar modes (page 69).
1. From the Home screen, select
Radar.
2. Select
Cruising, Harbor, Offshore, or Sentry mode.
3. Select
Menu > Gain.
4. 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 more-distant targets
to blink or disappear from the Radar screen.
Restoring the Default Sea Clutter Setting
NOTE: Depending upon the radar in use, the sea clutter setting congured for use in one radar mode
may or may not be applied to other radar modes (page 69).
1. From the Home screen, select
Radar.
2. Select
Cruising, Harbor, Offshore, or Sentry mode.
3. Select
Menu > Noise Rejection > Sea Clutter > Presets.
4. Select a setting that reects present sea conditions:
Rough, Medium, or Calm.
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.
NOTE
: Depending upon the radar in use, the sea clutter setting congured for use in one radar mode
may or may not be applied to other radar modes (page 69).
1. From the Home screen, select
Radar.
2. Select
Cruising, Harbor, Offshore, or Sentry mode.
3. Select
Menu > Noise Rejection > Sea Clutter > Presets.
4. Select a setting that reects present sea conditions:
Rough, Medium, or Calm.