Rain
Custom: Adjustable
Harbor: Adjustable
Offshore: Adjustable
Weather: Adjustable
Bird: Adjustable
Target Separation
Custom: Adjustable
Harbor: Medium
Offshore: OFF
Weather: OFF
Bird: OFF
Noise Rejection
Custom: Adjustable
Harbor: Medium
Offshore: High
Weather: Medium
Bird: High
Fast scan
Custom: Adjustable
Harbor: High
Offshore: High
Weather: OFF
Bird: OFF
* Maximum range is dependent on antenna length.
Modes in dual ranges
(Halo Radar only)
Modes can be set independently for each range. For example, you can have Offshore mode
for range A and Weather mode for range B. However, interaction between ranges occurs in
some cases:
• When using Bird mode for both ranges, maximum range is restricted to 24 NM and range
resolution is reduced.
• Fast scan - The antenna rotation speed is set to the slower of the two modes selected. For
example, Fast Scan is disabled when using Harbor and Weather modes because Fast Scan
is Off in Weather mode.
• The Interference reject setting can affect the interference seen or removed on both
ranges.
Directional clutter rejection
(Broadband 4G Radar only)
This mode automatically works when GAIN = AUTO and SEA = HARBOR or OFFSHORE. The
purpose is to allow smaller vessels to be seen in the leeward direction of the sea clutter. The
GAIN of the radar receiver is increased dynamically during the sweep, in the leeward
direction, for increased target sensitivity in heavier sea states.
When GAIN or SEA = MANUAL, the Directional Clutter Rejection mode will be OFF (non-
directional).
In addition, CALM, MODERATE or ROUGH STC Curve settings are available in the Radar
options menu to better optimize the radar image to your liking.
Gain
The gain controls the sensitivity of the radar receiver.
A higher gain makes the radar more sensitive to radar returns, allowing it to display weaker
targets. If the gain is set too high, the image might be cluttered with background noise.
Gain has a manual and an automatic mode. You toggle between automatic and manual
mode in the slide bar, or by pressing and holding the rotary knob.
Sea clutter
Sea clutter is used to filter the effect of random echo returns from waves or rough water near
the vessel.
When you increase Sea clutter, filtering the on-screen clutter caused by the echoes of waves
is reduced.
The system includes predefined Sea clutter settings for harbor and offshore conditions for all
radar systems except Halo, in addition to the manual mode where you can adjust the
settings. For all radar systems except Halo, you select Sea clutter modes from the menu, or by
a long press on the rotary knob. You can only adjust the Sea clutter value in manual mode.
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Radar | NSO evo2 Operator Manual
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