Chapter 6 RA83/84/85/93/94/95 Series
Using The Menu
Operation Manual
Warning symbols
The following symbols are used in the EPA functions to notify the operator of a
high-risk target or invalid plotting. These symbols will blink when they are shown.
This is a CPA alarm symbol that appears when a displayed target is
predicted to infringe a predetermined CPA and/or TCPA range. It
blinks at an interval of 0.5 seconds. The data can be displayed by
assigning the target number.
This is a CPA alarm symbol that appears when the relevant target
number is assigned. The rest of the features are the same as above.
This symbol appears with audio alarm when the target is lost during
tracking. The on-screen error message “UNRELIABLE PLOT DATA” will
also appear on the screen. The symbol mark and audio-visual alarm will
be turned off automatically 15 seconds after first appearance of the
symbol.
This symbol appears when the target enters the Guard Zone. The
symbol is shown overlaid on the target and is automatically deleted as
the target leaves the zone.
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.
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