Cpa / Tcpa Alarm - JRC JMA-7133-SA Instruction Manual

JMA-7100 Instruction Manual
5.5.1

CPA / TCPA Alarm

In the system, targets are categorized into two types: tracked / activate AIS targets
and dangerous targets.
The grade of danger can easily be recognized on the display at a glance. So the
officer can easily decide which target he should pay attention to.
It is not possible to switch off the tracked target visual alarm, unless tracking is
ceased, or the alarm condition no longer applies.
The types of target and alarm are shown below.
CPA / TCPA Alarm
Status
Tracked target
Activated AIS
target
Dangerous
target
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5.OPERATION OF TARGET TRACKING AND AIS
Since these alarms may include some errors
depending on the target tracking conditions, the
navigation officer himself should make the final
decision for ship operations such as collision
avoidance.
Making the final navigation decision based only on the
alarm may cause accidents such as collisions.
Symbol on A l a r m
display characters
12
AIS12
CPA/TCPA Beep
12
Red blinking
AIS12
Red blinking
CPA Limit and TCPA Limit: The Setting Values
5－ 41
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5.5 ALARM DISPLAY
A l a r m Conditions
sound
(Off) (Off)
・CPA>CPA LIMIT
・0>TCPA
・TCPA>TCPA LIMIT
The symbol is displayed
when one of the above
conditions is met.
・CPA≦CPA LIMIT
sound
・
0 ≦TCPA≦ TCPA LIMIT
(pee-poh)
An alarm is issued when all
Alarm
the conditions are met.
acknowle
The AIS targets that issues
dgeable
alarm refer to Section 5.3.9
5