Raymarine A series, Installation And Operation Instructions Manual

Page: 331 / 464

21.11 HD and SuperHD radar adjustments
You can use the presets and other functions to improve the quality of the radar picture.
The following settings are available from the Radar
menu and apply to HD radomes, HD and SuperHD
open array scanners:
Menu Item Description Options
Preset Mode The radar gain presets enable you to
quickly select pre-configured settings
to achieve the best picture in different
situations. Raymarine strongly
recommends the use of these presets
to achieve optimum results.
• Buoy — a special mode that enhances the detection of small
objects like mooring buoys. It is useful at ranges up to 0.75 nm.
• Harbor — this is the default mode. This setting takes account
of land clutter so that smaller targets, like navigation buoys,
are not lost.
• Coastal — accounts for the slightly higher levels of sea clutter
you might encounter out of harbor and adjusts the radar
display accordingly.
• Offshore — automatically adjusts for high levels of sea clutter.
• Bird Mode — a special mode that helps you to identify flocks
of birds, useful when identifying suitable fishing locations, for
example.
Note: Bird Mode requires a SuperHD open array with
software version 3.23 or above or an HD radome.
Rain The radar scanner detects echoes
from rain or snow. These echoes
appear on screen as countless small
echoes continuously changing size,
intensity and position. Turning the
rain clutter function On suppresses
the bulk effect of rain returns from
around your vessel, making it easier
to recognize other objects. You can
adjust the intensity of this setting
between 0 and 100%. • On — enables the Rain function and allows you to adjust the
setting between 0 and 100%.
• Off — disables the Rain function. This is the default.
Adjust Preset Each of the gain presets can be
manually adjusted using gain, color
gain and sea clutter functions. • Gain — enables you to use a preset in automatic mode, or to
adjust its gain manually between 0 and 100%.
• Color Gain — adjusts the intensity (color) of displayed targets,
but does not affect the number of targets displayed. Increasing
the color gain causes more targets to be displayed in the same
color, which may help you to determine whether an object is
an actual target, or just background noise. Reducing the color
gain may provide better target detail and detection.
• Sea — radar echoes from waves around your vessel can
clutter the center of the radar picture, making it difficult to
detect real targets. Adjusting the sea gain reduces this
clutter for up to 5 nautical miles (depending on wave and sea
conditions) from your vessel.
• SuperHD Controls — for SuperHD scanners only:
– Antenna Boost: scales the effective antenna size. At
zero, the effective antenna size matches its actual size.
At 95%, the effective antenna size is doubled. Increasing
the effective antenna size separates targets that appear
merged at lower settings.
– Power Boost: adjusts effective transmit power. At zero, the
radar operates at its standard power (4 kW or 12 kW). At
90, the effective power is increased by a factor of at least
two. Increasing the power makes targets more distinct from
noise. For maximum benefit, reduce power boost to prevent
saturation of strong targets.
Radar application
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