Changing The Echo Expansion Setting - Simrad NX40 Installation & Operation Manual

small targets may not be shown in the radar window.
If the sea clutter mode is set to Harbour or Offshore, and
you adjust the sea clutter level manually, the sea clutter
mode changes to Manual.
If you are in Range Rider mode when you adjust the sea
clutter level, the sea clutter mode does not change to
manual but the setting is stored and used automatically
whenever you use the same range again.
To change the sea clutter level
>
Adjust Radar
17-6-5 Changing the rain clutter
Rain clutter consists of random dots that can merge into
badly-defined echoes on your radar screen.
The random signals are returned from rain, hail, sleet, or
snow and can result in a confusing display.
If the rain clutter is set too low, there will be excessive
rain clutter shown whenever it's raining. If the rain clutter
is set too high, very large targets such as the coastline
will appear to be hollow.
To change the rain clutter setting
>
Adjust Radar
17-6-6 Changing the threshold level
Use this to define the threshold level of the weakest echo
that you want to show on the radar screen. The threshold
level is shown as a percentage.
100% is the maximum threshold level, meaning that only
the strongest echoes are shown. 0% is the minimum
threshold level, meaning that all echoes are shown.
To change the threshold level
>
Presentation

17-7 Changing the echo expansion setting

If you have several small targets in view and want to
make them easier to see, use the echo expansion
option.
Note that the resolution decreases as the target size
increases, so use this option only when target detection
and visibility is more important that the quality of the
display.
>
Sea Clutter Level
>
Rain clutter
> >
Threshold
Simrad NX40/45 Installation and Operation Manual
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