Adjusting Gain On The Radar Screen Manually; Minimizing Nearby Large-Object Interference; Minimizing Side-Lobe Interference On The Radar Screen; Adjusting Sea Clutter On The Radar Screen Automatically - Garmin AQUAMAP 10x2 Series Owner's Manual

Low or Auto High.
• To adjust the gain automatically to show birds over the surface of the
water, select Auto Bird.
NOTE: This option is not available on xHD open array or HD/HD+
radome models.

Adjusting Gain on the Radar Screen Manually

For optimal radar performance, you can manually adjust the gain.
1 From a radar screen or the radar overlay, select MENU > Gain.
2 Turn the knob clockwise 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.
3 Turn the knob counterclockwise to lower the gain until the speckles
disappear.
4 If boats, land, or other targets are within range, turn the knob
counterclockwise to lower the gain until the targets begin to blink.
5 Turn the knob clockwise to raise the gain until the boats, land, or other
targets appear steadily lit on the Radar screen.
60
6 Minimize the appearance of nearby large objects, if necessary.
7 Minimize 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.
1 From a radar screen or the radar overlay, select MENU > Gain.
2 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.

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.
1 From a radar screen or the radar overlay, select MENU > Gain.
2 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.

Adjusting Sea Clutter on the Radar Screen Automatically

Radar echos reflected from the sea waves could disturb the true targets, and
showing on the central area of the radar screen with a lot of random echo
signals which known as "sea clutter". The higher sea waves or the higher
the radar antenna installing on the vessel above the water, the more clutter
will extend. Sea Clutter appears on the screen as many small echoes which
might affect the radar performance.
You can set the AQUAMAP to automatically adjust the appearance of Sea
AQUAMAP™ 10x2/12x2 SERIES