Specifications

Simrad NX40/45 Installation and Operation Manual 87
covers a 1.5 dB signal range. The 8
color palette displays less detail, and
each color covers a 3 dB signal range.
Interference filter
No filter, normal setting.
Filters the echo signal to remove
spiky interference such as engine
noise or echosounders on nearby
boats.
Noise filter Averages the echo signal to remove
rapid changes. Select Medium or High
to give a smoother bottom trace–this
may help to detect a deeper bottom;
however these settings may also
remove fish echoes. Select Off for
best fishfinding.
Surface clutter filter Use this filter to hide the
surface noise. Any significant echoes
(such as fish) will still be shown.
Pulse length This can be used to specify the
length of the transmitted ultrasonic
pulse. A short pulse length improves
the window detail but contains
less energy, therefore it does not
penetrate as deeply into the water as
a longer pulse.
There is a choice of Auto, Short,
Medium or Long. The Auto setting is
recommended.
Pulse power This can be used to specify the power
output of the transmitted ultrasonic
pulse. Low power output conserves
the battery and produces a clear
display in shallow water.
There is a choice of Auto, Low,
Medium or High. The Auto setting is
recommended.
19-4 Setup > Radar
> Radar
Note: This option is shown only when the radar is enabled.
Rotation The current radar rotation is shown
in the top left corner of the radar
screen. If COG data or heading data
is not available from a compass, the
radar rotation is automatically set to
Head up. If heading data is available
from a compass, the options are:
North up works only when COG
data or heading data from a heading
sensor is available. North is always at
the top of the radar screen.