Radar (Optional)
113
Sea Clutter
The
sea
clutter radar setting filters interference from chop or heavy seas by lowering the
gain close to your vessel. Touch the radar button and select
Sea Clutter
to make
adjustments. Raise the clutter setting when you expect an increase in interference from
wave action: the higher the waves, the higher your clutter setting.
Sea clutter filtering starts at your vessel. As you increase the clutter percentage, the
area being filtered expands around your vessel. The higher the clutter setting, the
farther out the filter reaches.
Gain
Gain is the measure of the radar receiver’s sensitivity. To adjust the gain, press the
radar button and from the radar menu, select the
Gain
button.
To achieve a radar display with minimal distortion, you should first select a range, then
raise the gain just enough to show radar targets without speckling. Too high a gain can
produce speckling. (So can waves or chop around your vessel - if this is the cause, you
can remove speckles by increasing the sea clutter setting.)
Notes!
x
Most of the time, the radar targets match the actual object size. However,
some objects, especially if equipped with radar reflectors (as buoys often
are), may appear larger than actual size.
x
Keep in mind that the radar may not see targets that are positioned just
beyond near targets.
Range
The range setting tells Maestro Navigator how far from the vessel the radar should look.
For example, at a range of
¼
mile, the radar will scan
¼
mile radius around your vessel.
Range can be specified manually (touch the radar button, press Range and choose a
distance), or set to automatically cover the visible chart area (press Range and choose
Automatic).
On the display, the square, shaded area indicates the reach of the radar. When you
adjust the range, the radar display is zoomed accordingly: for a longer range, the view is
zoomed out, and for a shorter range, it is zoomed in. When zooming out to a longer
range, the radar targets appear closer together in the center of the display (as though
you are viewing them from farther away). Zooming in, the targets are pictured farther
apart.
When viewing the radar data as an overlay against a chart or photo, it’s easier to set
range to automatic and let Maestro Navigator determine what range setting will provide
the best display. (When using manual control in these cases, it is easy to over zoom,
which results in rough-looking radar returns. If this happens, Maestro Navigator will put
up an explanation message and offer to fix the problem for you.)
Interference Rejection
If you see spoke-like marks on your radar display, they are likely caused by interference
from neighboring radar systems. To decrease this interference, turn on interference
rejection.
Summary of Contents for Maestro
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