CR44/54 Radar menu Chapter 3-17
Tune – see Glossary.
To return to AUTO after manual adjustment, press [CLR].
Gain – see also Glossary.
Press [CLR] to toggle between manual and auto operation.
Auto mode can be used in most situations, but at some occasions
manual adjustment leads to better performance of the system.
Sea – see also Glossary.
Press [CLR] to toggle between manual and auto operation.
Auto mode will improve sensitivity at sea when the distance to shore
is over 300 meters. Closer to shore and when approaching a harbour
will require manual sea adjustment. Alternativly, the auto sea maxi-
mum parameter must be reduced to a suitable level for these areas.
The manual setting will affect the system’s ability to remove sea
clutter in heavy sea situations.
Rain – see also Glossary.
- adjusting for Rain clutter: Rain clutter or FTC (Fast Time Con-
stant) removes the leading edge of the returning signal. Rain or
snow returns cause many small echoes, continually changing in size
and position to appear as a hazy area on the display. Rain and snow
targets do not have much depth. By removing the leading edge, the
unwanted echoes will disappear leaving real targets visible. The
amount of delay is controlled by the rain clutter adjustment. As you
increase the adjustment, the delay will get larger causing the return-
ing signals to decrease, or disappear. Do not adjust the rain clutter
too high, as this will eliminate all small targets.
To properly adjust for rain clutter:
1. Set rain clutter zero.
2. Set gain.
3. Slowly increase rain clutter until the hazy area caused by the rain
or snow become less dense. Increasing it too much will not only
remove the rain clutter, but also any targets inside the rain area.
Note! Since Rain and Snow are continually changing in size and
density, tweaking of the rain clutter adjustment is necessary to
maintain the best results.
EBL (Electronic Bearing Line) - bearing and distance (read-only)
from ship’s position to cursor. Two independent EBLs are available
- see section 3.2.6.
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