Appendix A-4
CR44/54 Glossary of terms
Radar section:
Cursor function
– The cursor appears on the display as a small
symbol.
To activate the cursor, just press the cursor key. The cursor may now be
positioned by using the cursor key. When the cursor is set to a position on the
screen, the bearing and distance from ship’s position to cursor position will be
displayed in the top line of the screen. To turn off the cursor, press CLR.
When heading data is available, the chart cursor will be synchronized to the
radar cursor, and thus be controlled by the radar cursor in the Radar & Chart
display.
EBL (Bearing mode) key
– the EBL bearings may be displayed in either
degrees Relative “R” or True “T”, depending on the selected orientation (HU,
NU, TM).
GAIN control
- adjusts the gain level of the radar’s receiver. The Gain control
level is usually set for the best target presentation with a slight noise speckle
in the background on the 12 or 24nm range. The Gain control level may
be reduced on shorter ranges to improve target definition as necessary and
increased on longer ranges. Use some caution when adjusting the Gain control.
If gain is set too low, small or weak targets may be missed. If the gain is set
too high on short ranges, the display may become excessively covered with
noise speckle making target observation difficult.
On the longer range scales (24nm or greater), the sea clutter control may
be advanced to decrease excessive video clutter around own ship’s position in
the center of the display if necessary - see section 3.2.2 where minimum and
maximum levels are described.
Guard zone
The use of the Guard zone feature built into the radar can detect
approaching vessels entering your “comfort” zone and you can use the guard
zone while you are moving or when anchored to protect you in a full 360
degrees. The audio alarm can be sounded from the unit or through an external
speaker/buzzer wired into the system – see Electrical connections in Installa-
tion manual.
Warning! When you have set up a guard zone, the system generates an
alarm tone when there is an echo greater than the preset level in this zone.
However, this does not mean that the alarm tone is always generated from
ships or land alone. You may need to adjust sensitivity and set rain and sea
clutter properly after considering the effects of sea surface conditions and
meteorological conditions (rain or snow). Note also that this function does not
eliminate the need for maintaining a watch in your ship.
