Setting The Guard Zone - Koden MDC-1840BB Operation Manual

MDC-1840BB/1841BB/1860BB/1810BB/1820BB Series
Operation Manual

5.5.14 Setting the Guard Zone

The Guard Zone Alarm warns the operator a target has entered the preset alarm zone.
When the target stays in the zone for more than 8 seconds, the ALARM sign will flicker
and an audio alarm sounds. Press the AUDIO OFF key to silence the alarm.
To set up the position of the Guard Zone.
(1) Press the ALARM (GZ) key. This allows the EBL and VRM controls to be used for
moving the Alarm Zone in azimuth and range, respectively.
(2) Move the EBL control to set the position of the Guard Zone in azimuth. The
center bearing of the Guard Zone will be displayed in the lower right corner of
the screen.
(3) Move the VRM control to set the position of the Guard Zone in range. The
distance of the outer edge of the Guard Zone will be displayed in the same place
as the bearing display. The minimum distance is limited to 0.6 NM.
To set up the depth and width of the Guard Zone
(Reference drawing: Figure 5.4 The outline of the Guard Zone Alarm)
(4) Press the EBL SEL key and rotate the EBL control to set up the width of the
alarm zone. An arrow mark will be shown on the front of the WIDTH to indicate
width is active to control. A further press of the key will return to control the Guard
Zone in azimuth.
(5) Press and hold the VRM SEL key and rotate the VRM control to set up the depth
of the alarm zone. An arrow mark will be shown on the front of the DEPTH to
indicate depth is active to control. A further press of the key will return to control
the Guard Zone in range. The minimum distance of the inner zone to own ship is
limited to 0.5 NM.
(6) Press the ENT key to fix the settings. The Guard Zone will be shown on the
screen.
CAUTION: In the following case, the alarm function will become inoperative. The
ALARM range and bearing displays accordingly flicker to notify that the function is
inoperative.
(1) When the alarm zone is set in the vicinity of the screen center.
(2) When the alarm zone is set beyond the viewable screen area caused by
improper range scale setting such as, the range scale is too short,
off-centering is too much, etc.
0093142122-10
Chapter 5
Basic Operation
5-15