Setting The Guard Zone; To Set Up The Position Of The Guard Zone; To Set Up The Depth And Width Of The Guard Zone - Koden MDC-1840BB Operation Manual

Chapter 6 MDC-1840BB/1841BB/1860BB/1810BB/1820BB Series
Using The Menu

6.7.6 Setting the Guard Zone

The Guard Zone Alarm warns the operator an entry of a target to a preset alarm zone.
When the target enters the zone, a flashing equilateral triangle with its apex down is
shown to mark the target. (Refer to Figure 6.7) At the same time, the GZ sign flickers
and an audio alarm sounds. To stop the audio alarm, press the AUDIO OFF key.

6.7.6.1 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.

6.7.6.2 To set up the depth and width of the Guard Zone

(Reference drawing: Figure 6.7 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.
(6) Press the ENT key to fix the settings. The Guard Zone will be shown on the
screen.
Caution: In the following circumstances, 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 lower than 0.5 NM.
(2) When the alarm zone is set beyond the viewable screen area caused by an
improper range scale setting such as, the range scale is too short,
off-centering is too much, etc.
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Operation Manual
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