Raymarine E90W, User Reference Handbook

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9.8 Radar tuning: HD and SuperHD digital scanners
You can use the gain presets and other functions to improve the quality of the radar picture.
The following settings apply to HD radomes and HD and SuperHD
open array digital scanners:
Tuning method Related options Description
Gain presets
• 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.
For each preset, the following options are available:
• 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 significantly 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.
• 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.
• Sea Gain — 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:
The digital 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. However, each of the gain presets
can be manually adjusted using gain, color gain, rain,
and sea gain functions.
Using radar
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