Furuno FR-2105-B - Manual (Page 101)

- 2 . 22-
Guard zone alarm
Visual and aural alarms are generated when a target transits the operator-set guard zone. Press
the AUDIO OFF key to acknowledge and silence the guard zone aural alarm. (Refer to
paragraph 2.14 Setting a Guard Zone for further information.)
Lost target alarm
When the system detects a loss of a tracked target, the target symbol becomes a flashing
diamond ( ) and the label "LOST" appears at the screen bottom. At the same time, an aural
alarm is produced for one second.
Press the LOST TARGET key to acknowledge the lost target alarm. Then, the lost target mark
disappears.
Target full alarm
When the memory becomes full, the memory full status is indicated and the relevant
indication appears on the screen and a short beep sounds.
Manually acquired targets
The indication "MAN TARGET FULL" appears at the screen bottom and a short beep tone
sounds when the number of manually acquired targets reaches 20 or 40 depending on whether
auto acquisition is activated or not.
Automatically acquired targets
The indication "AUTO TARGET FULL" appears at the screen bottom and a short beep tone
sounds when the number of automatically acquired targets reaches 20.
System failure alarm
When the ARP board receives no signal input from the radar or external equipment, the screen
shows both "SYSTEM FAIL" associated with an indication denoting offending equipment,
also releasing an aural alarm. The missing signals are denoted as shown below:
Missing Signal Indication
* Speed log signal LOG
* Heading signal, Gyrocompass GYRO
Trigger signal from radar TRIGGER
Video from radar VIDEO
* Bearing signal from radar antenna AZIMUTH
* Heading pulses from radar antenna HEADLINE
* The alarm is available with or without ARPA.