Raymarine C140w - Manual (Page 109)

9.7 Radar tuning — DIGITAL scanners
You can use the gain presets and other functions to improve the
quality of the radar picture.
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 0.75nm.
• 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.
For each preset, the
following options are
available:
• Gain — enables you
to use a preset in
fully 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.
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.
Tuning method Related options Description
• 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:
Using radar 109