JRC JMA-5206, Instruction Manual, Page: 245 / 462

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5.2 ATA OPERATION
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Guard Zone Alarm
CAUTION
In setting a guard zone, it is necessary to adjust
the gain, sea clutter suppression and rain/snow
clutter suppression to ensure that target echoes
are displayed in the optimum conditions. No
guard zone alarms will be issued for targets
undetected by the radar, and this may cause
accidents such as collisions.
The guard zone functions are to set a zone at an arbitrary range and to deliver an alarm if any target intrudes
within this zone.
For the method of setting a guard zone, refer to page 3-59, section 3.5.19 Set Guard Zones.
Guard Zone Alarm
Status Symbol on display Alarm characters Alarm sound Conditions
Target entering
the guard zone
GZ
Beep sound (pipipi)
Acknowledgeable
An alarm sound is generated
while a
target
has entered into
the range of 0.5 NM between
the outer and the inner ring.
Guard Zone
HL