Section 6 Target Tracking and AIS 6-58
The types of target and alarm are shown below.
Dangerous Target Alarm
Status
Symbol on
display
Alert
characters
Alarm sound Conditions
Tracked
target
Activated
AIS target
(Off) (Off)
• CPA > CPA Limit
• 0 > TCPA
• TCPA > TCPA Limit
The symbol is displayed
when one or more of the
above conditions are met.
Dangerous
target
Red blinkin
CPA/
TCPA
Beep sound
(beep-beep-beep)
Alarm
acknowledgeable
• CPACPA Limit
• 0TCPA
TCPA Limit
An alarm is issued when all
the conditions are met.
The sleeping AIS targets will
be activated.
CPA Limit and TCPA Limit: Setting Values
6.7.2 Alarm for new target acquired in automatic
acquisition guard zone (New target)
In setting an automatic acquisition 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 automatic acquisition guard zone alarms will be issued for targets
undetected by the radar, and this may cause accidents such as collisions.
The automatic acquisition function sets a zone in a range and issues an alarm when a new target
(which is not yet acquired) goes into this zone.
For the setting of an automatic acquisition guard zone, refer to "6.5.1 Acquiring target".
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