5-47
z If the gain, sea clutter suppression, rain/snow clutter
suppression are not adjusted adequately, the lost
target alarm may be easily generated. So such
adjustments should be mad carefully.
Lost Target Alarm
When it is impossible to continue tracking any acquired and tracked target, or the data of AIS target cannot
received for a specified time, the LOST alarm will be generated. The typical causes for alarm
generation are shown below, but not limited to the following:
• The target echo is very weak.
• The target is shadowed by a shore or a large ship and its echo is not received.
• The target echo is blurred by sea clutter returns.
If a target under tracking goes out of a range of 32 nm and can no longer be tracked, it is canceled without a
lost target alarm.
Lost Target Alarm
Status Symbol on display Alarm characters Alarm sound Conditions
Lost target
Red Blinking
Lost
Beep sound (pee)
Alarm
acknowledgeable
The alarm will sound once
when a lost target symbol is
displayed.
Gyro Set Alarm
The GYRO I/F in this system receives signals from a gyro. Even if the power is turned off, the system will
follow up the gyro. However, the system stops the follow-up operation when the power of the master gyro
is turned off or when any trouble occurs to the line. When the power of the master gyro is recovered, the
Set Gyro alarm will be generated.
If this alarm occurs, set the gyro.
Gyro Set Alarm
Alarm characters
Alarm sound
Conditions
Set Gyro Beep sound (pipi-pipi)
The signals from the gyro are stopped, but the gyro is
recovered.
Attention
12
AIS12
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