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3. ARPA OPERATION
3-9
3.10 Proximity Alarm
The proximity alarm alerts you when an ARPA target is within the range you set. The
audio alarm sounds and the alarm message "PROXIMITY" appears. The target sym-
bol changes to a dangerous target symbol (triangle, see section 3.9) and flashes with
its vector. Press any key to stop the audio alarm. The flashing continues until the tar-
get is not within the range set, the alarm range is changed to exclude the target, or the
proximity alarm is deactivated.
1. Press the MENU key to open the menu.
2. Use S or T to select [Target] and press the ENTER key.
3. Use S or T to select [Proximity] and press the ENTER key.
Proximity settings
4. Use S or T to select the range and press the ENTER key.
5. Press the MENU key to close the menu.
3.11 Lost Target
When the system detects a lost target, the audio alarm sounds
and the alarm message "LOST" appears. The target symbol
becomes a flashing square like the illustration to the right.
When the system detects the target again, the target symbol
becomes a normal symbol.
To erase a lost target symbol, put the cursor on the symbol and press the CANCEL/
HL OFF key. If you leave a lost target symbol flashing, the symbol disappears after
one minute.
You can remove all lost ARPA targets from the screen as follows:
1. Press the MENU key to open the menu.
2. Use S or T to select [ARPA] and press the ENTER key.
3. Use S or T to select [ACK Lost Targets] and press the ENTER key.
ACK Lost Targets options
4. Use S to select [Yes] and press the ENTER key. All lost targets symbols are
erased from the screen and the long beep sounds.
5. Press the MENU key to close the menu.
Lost target symbol
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